$$3 \frac { 3 } { 8 } \% 80$$
$\frac{27}{10}=2.7$
$$\frac{3\times 8+3}{8\times 100}\times 80$$
$$\frac{24+3}{8\times 100}\times 80$$
$$\frac{27}{8\times 100}\times 80$$
$$\frac{27}{800}\times 80$$
$$\frac{27\times 80}{800}$$
$$\frac{2160}{800}$$
$$\frac{27}{10}$$
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$\frac{3 ^ {3}}{2 \cdot 5} = 2\frac{7}{10} = 2.7$
