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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 $63%$