Mrs. Aquino retires at the age of 63 and uses her life savings of 120,000 to purchase an annuity. The life insurance company gives an interest rate of 6% and they estimate that her life expectancy is 15 years. How much annuity due (that is how big an annual pension) will she receive?

Advanced Engineering Mathematics
10th Edition
ISBN:9780470458365
Author:Erwin Kreyszig
Publisher:Erwin Kreyszig
Chapter2: Second-order Linear Odes
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3.6 UNKNOWN PERIODIC PAYMENTS
S = RSmi
Often, we know the present or future value, the interest rate and the number of periods, but need to
7500 = RB10.07/12
determine the size of the annuity. To determine the size of an annuity is to find the periodic payment.
7500
R =
Example 18. How much quarterly payment is necessary to pay 1,000 loan due after 5 years at 6% compounded
80.07/12
quarterly?
7500
Solution: Given: (simple ordinary annuity) S = 1,000, j = 6%, m = 4, t=5 years, n = 20
R =
At the date of the loan,
48
0.07
1+12 -1
0.07
5= RSmi
12
0.07
12
1000 = Re00.015
7500
R =
1000
(1.00583333 48 1
R =
2ob.015
(1.00583333)
0.00583333
1000
(1.01520 -1
(7500)0.00583333)
R-
(1.00583333)48 -11.00.58 3333)
0.015
R.1000(0.015)
(1.01520 -1
R=43,25
R= 135.06
7500 x 0.00583333 +(1.00583333 ^ 48 - 1) +1.00583333 = 135.06
E 1000 x 0.015 +( 1.015 ^ 20 - 1) = 43.25
Example 21. Find the quarterly payment for 21 quarters to discharge an obligation of 12,000 if money is worth 4
V% compounded quarterly and the first payment is due at the end of 3 years and 9 months.
Example 19. If a man lends 1,000 at 8% per annum convertible quarterly, how much can be received from the
borrower at the end of every quarter to pay the loan exactly at the end of 10 years?
Solution: Given: A = 12,000, j = 4%, m = 4, h = 14, n= 21
Solution: Given: A = 1,000, j = 0.08, m = 5, t= 10 years, n= 40
At the date of the loan,
A = R(an -an)
A = Ra
12000 = R(ag0.01125 - arm0.01125)
12000
1000 = Rago.02
R =
ag50.01125 - a0.01125
1000
R =
4010.02
12000
R=
1-1.01125 35 1-1.01125 14
0.01125
4
1000
0.01125
1-(1.02) 40
0.02
12000
R =
(1.01125 14-(1.01125) 35
R= 1000(0.02)
1-1.02)
r40
0.01125
12000(0.01125)
(1.01125)14 -(1.01125)- 35
R = 36.56
R
R= 754,10
Example 20. How much must be saved at the beginning of cach month starting now to accumulate 7,500 for 4
yeurs at 7% compounded monthly?
Solution: Given: (simple annuity due)S= 7,500, j= 7%, m = 12, t= 4 yeurs, n = 4
E 12000 x 0.01125 +( 1.01125 - 14 - 1.01125 ^- 35 ) = 754.1O
From the results of examples 18 to 21, formulas for R can be summarized as follows:
Given
Formula
Formula
Si
R:=
Accumulated amount of ordinary annuity
(1 + 1)" - 1
Si
S
R =
R
Accumulated amount of annuity due
(1 + 1)" – 1)(1 + 1)
Si
R:=
Accumulated amount of deferred annuity
(1 + 1)" – 1
Ai
A
Present value of ordinary annuity
R =
1-(1+ 1) n
ami
Ai
Present value of annuity due
A
R =
mi
R =
(1- (1 + 1) ")(1 +1)
Ai
A
R-
R =
(1 + 1))" h – (1 + 1)– (n + h)
(anthi - ami )
Ai(1 + ih
Present value of deferred annuity
R=
A
1- (1 + 1) n
R =
ami (1+i)
Transcribed Image Text:3.6 UNKNOWN PERIODIC PAYMENTS S = RSmi Often, we know the present or future value, the interest rate and the number of periods, but need to 7500 = RB10.07/12 determine the size of the annuity. To determine the size of an annuity is to find the periodic payment. 7500 R = Example 18. How much quarterly payment is necessary to pay 1,000 loan due after 5 years at 6% compounded 80.07/12 quarterly? 7500 Solution: Given: (simple ordinary annuity) S = 1,000, j = 6%, m = 4, t=5 years, n = 20 R = At the date of the loan, 48 0.07 1+12 -1 0.07 5= RSmi 12 0.07 12 1000 = Re00.015 7500 R = 1000 (1.00583333 48 1 R = 2ob.015 (1.00583333) 0.00583333 1000 (1.01520 -1 (7500)0.00583333) R- (1.00583333)48 -11.00.58 3333) 0.015 R.1000(0.015) (1.01520 -1 R=43,25 R= 135.06 7500 x 0.00583333 +(1.00583333 ^ 48 - 1) +1.00583333 = 135.06 E 1000 x 0.015 +( 1.015 ^ 20 - 1) = 43.25 Example 21. Find the quarterly payment for 21 quarters to discharge an obligation of 12,000 if money is worth 4 V% compounded quarterly and the first payment is due at the end of 3 years and 9 months. Example 19. If a man lends 1,000 at 8% per annum convertible quarterly, how much can be received from the borrower at the end of every quarter to pay the loan exactly at the end of 10 years? Solution: Given: A = 12,000, j = 4%, m = 4, h = 14, n= 21 Solution: Given: A = 1,000, j = 0.08, m = 5, t= 10 years, n= 40 At the date of the loan, A = R(an -an) A = Ra 12000 = R(ag0.01125 - arm0.01125) 12000 1000 = Rago.02 R = ag50.01125 - a0.01125 1000 R = 4010.02 12000 R= 1-1.01125 35 1-1.01125 14 0.01125 4 1000 0.01125 1-(1.02) 40 0.02 12000 R = (1.01125 14-(1.01125) 35 R= 1000(0.02) 1-1.02) r40 0.01125 12000(0.01125) (1.01125)14 -(1.01125)- 35 R = 36.56 R R= 754,10 Example 20. How much must be saved at the beginning of cach month starting now to accumulate 7,500 for 4 yeurs at 7% compounded monthly? Solution: Given: (simple annuity due)S= 7,500, j= 7%, m = 12, t= 4 yeurs, n = 4 E 12000 x 0.01125 +( 1.01125 - 14 - 1.01125 ^- 35 ) = 754.1O From the results of examples 18 to 21, formulas for R can be summarized as follows: Given Formula Formula Si R:= Accumulated amount of ordinary annuity (1 + 1)" - 1 Si S R = R Accumulated amount of annuity due (1 + 1)" – 1)(1 + 1) Si R:= Accumulated amount of deferred annuity (1 + 1)" – 1 Ai A Present value of ordinary annuity R = 1-(1+ 1) n ami Ai Present value of annuity due A R = mi R = (1- (1 + 1) ")(1 +1) Ai A R- R = (1 + 1))" h – (1 + 1)– (n + h) (anthi - ami ) Ai(1 + ih Present value of deferred annuity R= A 1- (1 + 1) n R = ami (1+i)
09. Mrs. Aquino retires at the age of 63 and uses her life savings of 120,000 to purchase an annuity. The life
insurance company gives an interest rate of 6% and they estimate that her life expectancy is 15 years. How
much annuity due (that is how big an annual pension) will she receive?
Transcribed Image Text:09. Mrs. Aquino retires at the age of 63 and uses her life savings of 120,000 to purchase an annuity. The life insurance company gives an interest rate of 6% and they estimate that her life expectancy is 15 years. How much annuity due (that is how big an annual pension) will she receive?
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