Answer:
53760
Explanation:
12000 x 2 = 24000
24000 x .20 = 4800 this is the amount he gave to each of his sons
4800 x 3 = 14400 this is the amount he gave to his sons in total
24000 + 14400 = 38400
38400 x .40 = 15360 this is how much he gave to his wife
15360 + 38400 = 53760