Question
The average cost of items bought by a shopkeeper is
₹150. He purchases another item for ₹270, and the average increases by ₹10. Find the total cost of the items before the last purchase.Solution
Let the number of items before this one be 'P'.
Cost before = 150P
(150P + 270) / (P + 1) = 160
=> 150P + 270 = 160P + 160
=> 10P = 110 => P = 11
Total cost = 150 × 11 = ₹1,650
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