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Answer 1 · 2017-03-25T04:51:51

Percent of decrease is $63 %$ $63%$

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

Sale price is $$ 5.50$ $$5.50$ at $x$ $x$

Then: $\frac{$ 15}{$ 5.50} = \frac{100 %}{x}$ $($15)/($5.50) = (100%)/x$

Cross multiply: $15 x = 5.50 \cdot 100 %$ $15x = 5.50*100%$

$x = \frac{550 %}{15} = 36.67 %$ $x = (550%)/15 = 36.67%$ Which is the sale price percent.

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

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