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1. A vendor bought toffees at 6 for a rupee. How many for a rupee must he sell to gain 20%?

A. 4

B. 7

C. 5

D. 6

Solution:

\begin{aligned} C .P . of 6 toffees = R s . 1 \\ S .P . of 6 toffees \\ = 120 % of R s . 1 = R s . \frac{6}{5} \\ For R s . \frac{6}{5}, toffees sold = 6. \\ For R s . 1, toffees sold = 6 \times \frac{5}{6} = 5 \end{aligned}

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