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Question
A credit card promotion offers a discount on all purchases made with the card. The discount is directly proportional to the size of the purchase. If you save $1.35 on a$20 purchase, how much will you save on a $173 purchase?
Solution
VerifiedStep 1
1 of 2The variation equation is
where represents the constant of variation, is the discount and the size of the purchase.
First, find the constant of variation.
To find the constant of variation, substitute in the variation equation for and for .
The constant of variation is .
Now, substitute in the variation equation for and for to find .
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