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Study the graph drawn below and answer the questions that follow.
If, on an average, the unit cost of a registered letter is Rs.10, how much total amount must have been spent on registered letters for the entire period shown?

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Rs. 59800

Rs. 60000

Rs. 59400

Rs. 59080

answer is A.

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Detailed Solution

$\begin{array}{l} = 724 + 1060 + 1048 + 1193 + 823 + 1132 \\ = 5980 \\ E a c h l e t t e r c o s t R s . 10 \\ ∴ 5980 \times 10 = 59800 \end{array}$

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