hello, i think that the cost of new car is 21000 x 1.2 = 25200 and the part exchange allowance is 25200 – 11900 = 13300 The carrying value of the old car is 17760 – 17760/4 x 3 = 4440, so the gain on sale of old car is 13300 – 4440 = 8860 Is my answer corect ? Thank u!