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Answer 1 · 2017-03-25T04:51:51

Percent of decrease is #63%#

Original price is #$15# at #100%#

Sale price is #$5.50# at #x#

Then: #($15)/($5.50) = (100%)/x#

Cross multiply: #15x = 5.50*100%#

#x = (550%)/15 = 36.67%# Which is the sale price percent.

To find the percent of decrease we need to subtract the sale price percent from the original #100%#

#100% - 36.67.% = 63.3%# rounded off to #63%#