The sale price
S (in dollars) of an item is given by the formula
S=L-rL, where L is the list price (in dollars) and
r is the percent of discount (in decimal form).
(See Examples 4 and 6.)
a. Solve the formula for r.
b. The list price of the shirt
is $21.50. What is the
percent of discount?
Sale price:
$17.20