InterviewSolution
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Ram sold certain items in a day. When he calculated his daily earning he came to know that cost of one sold item is wrongly calculated as 150 instead of 250. Due to that the average price of all sold items is decreased by Rs. 10. Find the total number of sold items on that day.1). 202). 53). 104). 8 |
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Answer» Average = (sum of elements)/(number of elements) Let the number of ITEMS sold by Ram in a day be x and total amount earned after selling all items EXCEPT one WRONGLY calculated price item be Rs. m. Average price of all items sold in a day = OLD average = (total amount earned after selling all items)/number of items = (m + 150)/x Given, The cost of one sold item is wrongly calculated as 150 INSTEAD of 250, so average price is decreased by Rs. 10 Average of all items with new price 250 = new average = (total amount earned after selling all items)/(x) = {(m + 250)/x} Old average + 10 = new average ⇒ {(m + 150)/x} + 10 = (m + 250)/x ⇒ (m + 150) + 10x = (m + 250) ⇒ 150 + 10x = 250 ⇒ 10x = 100 ⇒ x = 10 ∴ Number of all sold items by Ram in a day is 10. |
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