Jack and Jill are friends who borrow from each other often. Last week Jack borrowed $1200 from Jill, which he promised to pay back with an interest of 10%. How much will Jack pay back?
Please answer the following question by reasoning step-by-step.
1320
The interest on the loan is 0.

1 * 1200 = $120.

The total amount Jack needs to pay back is 1200 + 120 = 1320.

.

So, the final answer is 1320