Assume the cost price of the racket is Rs CP.
Loss percentage = 26
Selling price = (1 - 0.26) CP = Rs 0.74CP
If he had sold it for 144 more => Selling price = 0.74 CP + 144
Gain percentage = 22 = (Selling Price - Cost price) x100 / Cost price
(0.74 CP + 144 -CP ) x100/CP = 22
74 + 14400/CP - 100 = 22
14400/CP = 100 + 22 -74 = 48
Hence the cost price of the rocket (CP) = 14400/48 = Rs 300