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The following pie-chart shows the percentage distribution of the expenditure incurred in publishing a magazine. Study the pie-chart and answer the question based on it.
$\textbf{Various Expenditures (in percentage) Incurred in publishing a Magazine}$

The price of the magazine is marked $20\%$ above the $C.P$. If the marked price of the magazine is ₹ $180$, then what is the cost of the paper used in a single copy of the magazine ?

1. ₹$36$
2. ₹$37.50$
3. ₹$42$
4. ₹$44.25$

Let CP $= 100\%,\;$ MRP $= 120\%$

Given that , $120\% \implies ₹180$

then $100\% \implies x$

therefore, $x = ₹150$

Now, the cost of the paper used in a single copy of the magazine $= 25\%\;\text{of}\;x = \dfrac{25}{100} \times 150 = ₹ 37.50.$

So, the correct answer is $(B).$
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