Sohan
Selling Price = Rs. 14400
Loss percantage = 10%
Cost price = Rs. x
x * 10% = 14400
x * 10 = 14400
100
x = 14400 / 10
100
x = 14400 * 100
10
x = 144000
Cost Price = Rs.144000
Rahul
Cost Price = Rs. 144000
Profit Percentage = 7%
Selling Price = 144000 + (7% of 144000)
= 144000 + ( 7 *144000)
100
= 144000 + (7*1440)
= 144000 + 10080
= Rs. 154080
Therefore, Rahul should sell his music system for Rs. 154080 to earn a profit of 7%.