$$\frac{15\%\times75QnL}{100\%}=$$
$\frac{45LQn}{4}$
$$\frac{\frac{15}{100}\times 75QnL}{1}$$
$$\frac{\frac{3}{20}\times 75QnL}{1}$$
$$\frac{\frac{3\times 75}{20}QnL}{1}$$
$$\frac{\frac{225}{20}QnL}{1}$$
$$\frac{\frac{45}{4}QnL}{1}$$
$$\frac{45}{4}QnL$$
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$\frac{45Ln}{4}$
