Question

'A' sells a watch to 'B' for 20 % profit. 'B' sells the watch to 'C' for 10 % loss. If 'C' pays Rs. 216, the cost price of the watch is.​

Answer 1

Let the C.P of A= Rs. X

Gain=20%

∴ selling price of A= 120/100 × rs x= rs 120x/100

C.P of B= rs 120x/100

Loss= 10%

∴ selling price of B= 90/100 × 120x/100= rs 27x/25

C.P of C= 27x/25

Given 27x/25=216

=> x= (216×25)/27

=> x= rs 200

:D

Answer 2

Answer:

Let P be the cost price.

B purchased at P(1+20/100)=P×1.2

C purchased at P×1.2×(1-10/100)=P×1.2×0.9

P×1.2×0.9=216

P=216/(1.2×0.9)=216/1.08=200Ans