How many DVDs can you buy for a gift certificate worth $100? How much money will vou have left over?

Question

Conversion factor: $8 per DVD Show all work using dimensional analysis

Answer 1

To find out how many DVDs you can buy with a $100 gift certificate, use dimensional analysis.

1 gift certificate = $100

Conversion factor: $8 per DVD

To find out the number of DVDs you can buy, divide the value of the gift certificate by the cost per DVD:

$100 / $8 per DVD = 12.5 DVDs

Since you can't buy a fraction of a DVD, you have enough money to buy 12 DVDs with the gift certificate.

To find out how much money you will have left over, subtract the cost of the DVDs from the value of the gift certificate:

$100 - ($8 per DVD * 12 DVDs) = $100 - $96 = $4

You will have $4 left over.