and 86%. What range of grades on the firth exam wtll result 3 for the course? 21. A retiree requires an annual income of at least $9000 from an investment paying 7.5% annual interest. How much should the retiree invest to achieve the desired return? arhond oorte of S60 000 Each diec conte 80 19 ond colle for S0 3 0 Hou

Algebra for College Students
10th Edition
ISBN:9781285195780
Author:Jerome E. Kaufmann, Karen L. Schwitters
Publisher:Jerome E. Kaufmann, Karen L. Schwitters
Chapter14: Sequences And Mathematical Induction
Section14.3: Another Look At Problem Solving
Problem 30PS
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can i please help with number21

19. A car rental agency rents a certain car for $40 per day with unlimited mileage or $24 per day plus $0.20 per mile. How far can a customer drive this car per day for
the $24 option to cost no more than the unlimited mileage option?
20. To receive a B in a course, you must have an average of at least 80% but less than 90% on five exams. Your grades on the first four exams were 95%, 79%, 91%,
20. 10
and 86%. What range of grades on the fifth exam will result in a B for the course?
21. A retiree requires an annual income of at least $9000 from an investment paying 7.5% annual interest. How much should the retiree invest to achieve the desired
return?
22. A company that manufactures compact discs has fixed monthly overhead costs of $60,000. Each disc costs $0.18 to produce and sells for $0.30. How many discs
should be produced and sold each month for the company to have a profit of at least $30,000?
Transcribed Image Text:19. A car rental agency rents a certain car for $40 per day with unlimited mileage or $24 per day plus $0.20 per mile. How far can a customer drive this car per day for the $24 option to cost no more than the unlimited mileage option? 20. To receive a B in a course, you must have an average of at least 80% but less than 90% on five exams. Your grades on the first four exams were 95%, 79%, 91%, 20. 10 and 86%. What range of grades on the fifth exam will result in a B for the course? 21. A retiree requires an annual income of at least $9000 from an investment paying 7.5% annual interest. How much should the retiree invest to achieve the desired return? 22. A company that manufactures compact discs has fixed monthly overhead costs of $60,000. Each disc costs $0.18 to produce and sells for $0.30. How many discs should be produced and sold each month for the company to have a profit of at least $30,000?
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