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What percent of Rs. 900 is 45?

(a) $5 \%$

(b) $25 \%$

(c) $12 \frac{1}{2} \%$

(d) $4 \%$
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Solution-

 Let $x \%$ of $900=45$

$\Rightarrow \frac{x \times 900}{100}=45$

$\Rightarrow x \times 900=45 \times 100$

$\therefore \quad x=\frac{45 \times 100}{900}=5 \% ;$ Ans.

$\therefore$ Correct option is $(a)$

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