$$9.8 \% 80$$
$7.84$
$$\frac{98}{1000}\times 80$$
$$\frac{49}{500}\times 80$$
$$\frac{49\times 80}{500}$$
$$\frac{3920}{500}$$
$$\frac{196}{25}$$
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$\frac{2 ^ {2} \cdot 7 ^ {2}}{5 ^ {2}} = 7\frac{21}{25} = 7.84$
