Question

days did he work?
3.4 A shopkeeper buys some pens at 8 per pen and the same number of pencils at 6 per pencil. He
makes a 10% profit on the pens and a 20% profit on the pencils. At the end of day, all the pens and
pencils are sold out and he makes a profit of 320. Find the number of pens purchased.​

Answer 1

Step-by-step explanation:

It can be best solved by taking an example. Let's take LCM of 2,3,4,5= 120

So he buys 60 pens at 3 for 30 that means 60 for 600. He buys the rest 60 at 4 for 48 that means 60 for 720. So the total cost of 120 pens is 1320.

He sells 120 pens at 5 for 56 that means 120 for 1344.

CP = 1320, SP = 1344, profit = 1344–1320=24

Profit %= (24/1320)*100= 1.82%

Thank you.