I believe the answer is 48 ... hope this helps
Answer:
-10
Step-by-step explanation:
Let x = number
10 less than a number is the same number doubled
x-10 = 2x
Subtract x from each side
x-10-x = 2x-x
-10 = x
The number is -10
He had to pay back 1080 per year or 90 per month in total he had to pay $160 more dollars of interest then what he got