Ryan went to the store to buy a CD. The CD was on sale for 10% off. If Ryan paid $13.50 for the CD, what was the original price of the CD?

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Answer 1 · 2015-12-27T14:38:24

The original selling price

# = color(blue)($15#

Since the CD was on 10% discount, this means Ryan needed to pay only #color(blue)(90%# of the original selling price.

#90% (S.P) = $13.50#

#color(blue)(90/100 )(S.P) = $13.50#

# S.P = 13.50 xx color(blue)(100/90#

# S.P = 13.50 xx 1.11#

# S.P = color(blue)($15#