CPM Homework Help : CC2MN Problem 10-30

A pair of shoes originally costs $\$42$ but is on sale for $33\%$ off. What is the new price? Show how you know.

Hint:

Think of $33\%$ as $3(10\%)+3(1\%)$ .

$10\%$ of $\$42$ is $\$4.20$
$1\%$ of $\$42$ is $\$0.42$

Answer:

$\$28.14$