$$2\frac{1}{2}=\frac{5}{2}$$ , $$7\frac{1}{3}=\frac{22}{3}$$
$$\frac{5}{2}\times\frac{22}{3}$$ = $$\frac{110}{6}$$
$$\frac{110}{6}$$ % = $$\frac{110}{600}$$
$$\frac{110}{600}\times870 = 159.5$$
Hence Option E is the correct answer.
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