Jack and Jill are friends who borrow from each other often. Last week Jack borrowed  $1200 from Jill, which he promised to pay back with an interest of 10%. How much will Jack pay back?
The interest on the loan is 0.1*1200=$
<gadget id="calculator">0.1*1200</gadget>
<output>120</output>
120.
The total amount Jack needs to pay back is 1200+120=
<gadget id="calculator">1200+120</gadget>
<output>1_320</output>
1320.

<result>1_320</result>