Answer:
475 billion dollars
Step-by-step explanation:
Let P be the customer credit
At the end of year X, 36% of P is gotten from automobile installment credit
57 billion credit is 1/3 of the automobile installment credit. This means that the total automobile installment credit 57*3 = 171 billion dollars
36% * P = 171
36/100 * P = 171
36P = 171 *100
P = 17100/36
P= 475 billion dollars