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A company's gross profit margin $P$ can be computed with the formula $P=\frac{R-C}{R},$ where $R=$ the company's revenue and $C=$ cost of goods sold. For the fiscal year 2008 , computer company Apple had revenues of $\$ 32.5$ billion and cost of goods sold $\$ 21.3$ billion. (Source: Apple, Inc.) What was Apple's gross profit margin in $2008 ?$ Express the answer as a percent, rounded to the nearest tenth of a percent.