Question
The average price of 80 mobile phones is Rs. 30,000. If
the highest and lowest price mobile phones are sold out then the average price of remaining 78 mobile phones is Rs. 29,500. The cost of the highest mobile is Rs. 80,000. The cost of lowest price mobile is?Solution
ATQ, Average price of 80 mobile phones is = 30,000 Sum of price of 80 mobile phones is = 30,000 × 80 = Rs. 24,00,000 Sum of price of 78 mobile phones is = 29,500 × 78 = Rs. 23,01,000 Sum of highest and lowest price of phones = 24,00,000 – 23,01,000  = Rs. 99,000 ∴ Cost of lowest mobile phone = 99,000 – 80,000 = Rs. 19,000
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