Question

A grocery store is offering a 50% discount off a $4.00 box of cereal. You also have a $1.00 off coupon for the same cereal. Use a composite function to show whether it is better to use the coupon before or after the discount. (Sorry for all the questions, I've been up all night doing this and I'm bad enough at math WITH sleep)

Answer 1

It is best to use the discount first because the more value, higher percent.

Discount First:
4.00*.5 = $2.00 TOTAL
$2.00-$1.00 = $1.00 GRAND TOTAL

Discount After:
4.00-1 = $3.00 TOTAL
3*.5 = $1.50 GRAND TOTAL

You would save 50 cents