DRDO Multi tasking staff Model paper 2

Short trick∶
Required price = 220/0.88 × 1.1 - 220/0.88 = 275 - 250 = 25
Detailed solution∶
S.P = 220
Loss percentage = 12%
⇒ 12 = [(C.P - 220)/C.P] × 100
⇒ 12C.P = 100C.P - 22000
⇒ 88C.P = 22000
⇒ C.P = 250
To make a profit percentage of 10%, SP should be,
⇒ 10 = [(S.P - 250)/250] × 100
⇒ 100 = 4S.P - 1000
⇒ S.P = 275
∴ Required difference = 275 - 250 = Rs. 25