Question

a shopkeeper bought 650 bulbs @ rs 10 each . if 50 bulbs were found to be defective or broken find the rate at which he should sell the remaining bulbs so as to gain 20% on the whole transaction .

Answer 1

Given:

A shopkeeper bought 650 bulbs @ rs 10 each.

To find:

The selling price of each bulb so as to gain 20%.

Solution:

1) The cost price to buy 650 bulbs is ₹6500.

2) it is given in the question that 50 bulbs are found to be damaged and shopkeeper wants to sell the remaining to gain a 20% profit.

3) So the selling price will be:

• 100% -------   ₹6500

• 1% -----------   6500/100

• 120% -------   65×120

                             ₹7800

So the selling price is ₹7800

4) But now, the shopkeeper can sell only 600 bulbs

so the selling price of the single bulb will be

• ₹7800/600

• ₹13

The selling price of each bulb is 13.