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Can someone help me with number 31 pls. Show steps pls.

Can someone help me with number 31 pls. Show steps pls.-example-1
User Kimmen
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\bf \begin{array}c \cline{1-1} \textit{a\% of b}\\ \cline{1-1} \\ \left( \cfrac{a}{100} \right)\cdot b \\\\ \cline{1-1} \end{array}~\hspace{5em}\stackrel{\textit{7.5\% of x}}{\left(\cfrac{7.5}{100} \right)}x \\\\[-0.35em] ~\dotfill\\\\ \cfrac{7.5}{100}\cdot \cfrac{10}{10}\implies \cfrac{75}{1000}\implies \cfrac{3}{40}

User Rajeev Mehta
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