- The original marked price of the bottle is Rs2,600.
- First, a 10% discount is applied.
- 10% of Rs2,600 is Rs260.
- The price after the first discount: Rs2,600 - Rs260 = Rs2,340.
- Then, a second discount of 30% is applied to the new price.
- 30% of Rs2,340 is Rs702.
- The price after the second discount: Rs2,340 - Rs702 = Rs1,638.
- Option:1, Rs1,768 - This option is incorrect.
- Option:2, Rs1,458 - This option is incorrect.
- Option:3, Rs1,528 - This option is incorrect.
- **Option:4, Rs1,638** ✅ - This is the correct selling price.

**YOUR ANSWER IS RIGHT**