Chapter 3.II, Problem 36RE

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8th Edition

Robert Brechner + 1 other

ISBN: 9781305585447

Textbook Problem

Sam Estero received a $50 gift card to iTunes for his birthday. If he downloaded 12 songs at $0.99 per song, 5 songs at $1.29 per song, and 4 apps for his iPhone at $1.99 per app, how much credit remained on the gift card?

To determine

**To calculate:** The credit remained on the $50 gift card to iTunes, which Sam Estero received for his birthday, when he downloaded 12 songs at $0.99 per song, 5 songs at $1.29 per song, and 4 apps for his iPhone at $1.99 per app.

Explanation

**Given Information:**

The provided value of gift card is $50, Sam downloaded 12 songs at $0.99 per song, 5 songs at $1.29 per song, and 4 apps for his iPhone at $1.99 per app.

**Formula used:**

For multiplying decimal numbers.

Step 1: Multiply the numbers as whole numbers are multiplied by ignoring the decimal points.

Step 2: Count the number of decimal places in the multiplier and multiplicand together.

Step 3: Put the decimal point in the product by counting decimal places as counted in step 2.

Step 4: Place zeroes to the left of the product to the provided the correct number of digits, if necessary.

For adding and subtracting decimal numbers.

Step 1: Write all the numbers vertically aligning at decimal points.

Step 2: Add zeros after decimal numbers where necessary.

Step 3: Work from right to left while performing the indicated operations.

Step 4: In the answer place the decimal point at the same place as in problem.

**Calculation:**

First, to find total prices of songs and apps that Sam downloaded,

Consider 12 songs at $0.99 per song and multiply them as whole numbers are multiplied.

Here the number of decimal places in 0.99 is 2 and in 12 is 0, so the total number of decimal places is 2.

Now put the decimal point in the product to have 2 decimal places,

So, the price of 12 songs at $0.99 per song, is $11.88.

Now, consider 5 songs at $1.29 per song and multiply them as whole numbers are multiplied,

Here the number of decimal places in 1.29 is 2 and in 5 is 0, so the total number of decimal places is 2.

Now put the decimal point in the product to have 2 decimal places,

So, the price of 5 songs at $1.29 per song, is $6.45.

Now consider 4 apps at $1.99 per app and multiply them as whole numbers are multiplied,

Here the number of decimal places in 1

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