Correct option is A
Given:
Selling Price for 20% loss = ₹840
Solution:
CP = 1−100Loss %SP
= 1−10020840
= 0.8840SP (for 25% gain)
= CP×(1+10025)
Find CP:
CP = 0.8840 = 1050
SP for 25% gain
SP = 1050 × 1.25 = 1312.5
Alternate Method:
After 20% loss = 100 - 20 = 80% = 840
1% = 10.5
CP = 100 = 1050
SP on CP = 125%
125% = 125 × 10.5 = 1312.5