Answer:

**For the first case:**

Loss% = ( Cost Price -Selling Price)/Cost Price x 100

Cost Price = CP = ?

Selling Price = SP = Rs. 1275

Loss% = 15%

So:

**For the second case:**

Gain% = (Selling Price - Cost Price)/Cost Price x 100

Loss% = 15%15 = (CP - 1275)/CP x 100

15CP = 100CP - 127500

15CP - 100CP = - 127500

- 85CP = - 127500

CP = 127500/85 = Rs. 1500.

**For the second case:**

Cost Price = CP = Rs. 1500

Selling Price = SP = ?

Profit% = 10%

So:

Gain% = (Selling Price - Cost Price)/Cost Price x 100

10 = (SP - 1500)1500 x 100

15000 = 100SP - 150000

100SP = 150000 + 15000 = 165000

SP = 165000/100 = Rs. 1650.

**Ans: Rs. 1650.**