Kanchan bought a ring and sold it to Mohan at a profit of 5%. Mohan sold it to Pramod at a loss of 25%. If Pramod paid Rs. 3150, then the cost price (in Rs. ) of the ring Kanchan bought is

Correct option is A

Given:
Pramod paid ₹3150.
Kanchan's profit = 5%.
Mohan's loss = 25%.
Formula Used:
​$$SP = CP \times \left(1 + \frac{\text{Profit}}{100}\right)\\\ \\ SP = CP \times \left(1 - \frac{\text{Loss}}{100}\right)$$​​
Solution:
Pramod's SP = ₹3150.
Mohan's CP = $$\frac{3150}{1 - \frac{25}{100}}$$​​ = ₹4200

Kanchan's CP = $$\frac{4200}{1 + \frac{5}{100}}$$​​ = ₹4000