Question

Carlos buys a game for $7.89 and some batteries for $5.49. He pays with a $20 bill. What is the best estimate of how much change he should get? Give an answer and explain your answer.

Answer 1

Given:

Carlos buys a game for $7.89 and some batteries for $5.49. He pays with a $20 bill.

To find:

The best estimate of the amount of change he should get.

Solution:

First we need to approximate the data values.

$\ 7.89\approx \ 8.00$

$\ 5.49\approx \ 5.50$

Now, the total cost of game and batteries is

$\ 8.00+\ 5.50=\ 13.50$

He pays with a $20 bill.

$Change=\ 20-\ 13.50$

$Change=\ 6.50$

Therefore, the estimated amount of change is $6.50.