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1. The cost of 4 dozen papers is Rs. 24. The cost of 1 score of papers (in rupees) is ?

A. 40

B. 20

C. 10

D. 42

Solution:

1 score of papers = 20 papers
Cost of 4 dozen papers = Rs.24
Cost of 20 papers

\begin{aligned} = \frac{24}{4 \times 12} \times 20 \\ = Rs .10 \end{aligned}

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