Question:medium

A dry fruit seller purchased 3 kinds of nuts at the rate of 100/kg, 80/kg and 60/kg. He then mixed them, respectively, in the ratio 3 : 4 : 5 by weight and sold the same to a customer at 50% profit. The price at which he sold to the customer is

Updated On: Nov 25, 2025
  • 110
  • 90
  • 70
  • 115
  • 120
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The Correct Option is D

Solution and Explanation

The correct answer is option (D):
115

Here's how to solve this problem, breaking it down step-by-step:

First, calculate the weighted average cost of the nuts. We're given the ratio of the nuts is 3:4:5. Let's assume the seller bought 3 kg of the first type, 4 kg of the second type, and 5 kg of the third type. This makes the total weight 3 + 4 + 5 = 12 kg.

Now, calculate the cost of each type of nut:

* Type 1: 3 kg * 100/kg = 300
* Type 2: 4 kg * 80/kg = 320
* Type 3: 5 kg * 60/kg = 300

Next, find the total cost of all the nuts: 300 + 320 + 300 = 920

Then, find the cost per kg of the mixture: 920 / 12 kg = 76.67/kg (approximately)

Finally, calculate the selling price with a 50% profit margin:

Profit per kg = 76.67 * 0.50 = 38.33
Selling price per kg = 76.67 + 38.33 = 115

Therefore, the seller sold the mixture at a price of 115/kg.
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