Question

A student received a coupon for 11% off the total purchase price at a clothing store. Let z be the

original price of the purchase. Use the expression below for the new price of the purchase. Write an
equivalent expression by combining like terms.
Z-0.112
Z-0.117=

Answer 1

Answer: 0.89z

Think of it like 100% - 11% = 89%

You save 11%, so you need to pay the remaining 89%

Taking 89% of z then leads to 0.89z

So that's why z - 0.11z = 0.89z