What will the last payment be to pay off a $1,250 computer plus 8% sales tax with monthly payments of $120?
$10
$11
$12
$20
$30

1250x.08= 100+1250= 1350 / 120 is 11.25 so 11 months of paying $120 leaves a $30 12th month payment.

Base on the question and the given values of the problem, I would say that the last payment would be to pay off a $1,250 computer plus  8% sales tax with monthly payment of $120 would be $12. I hope you are satisfied with my answer and feel free to ask for more if you have question and further clarification