Question

Hans bought a desktop computer and a laptop computer. Before finance charges, the laptop cost $450 more than the desktop. He paid for the computers using two different financing plans. For the desktop the interest rate was 9% per year, and for the laptop it was 6% per year. The total finance charges for one year were $300 . How much did each computer cost before finance charges?

Answer 1

Let D = cost of the desktop
Let L = cost of the laptop
L = D + 450

Total interest rate paid for one year was 300.00

That interest rate was composed of D * .09 + L * .06

Formula is .09*D + .06*L = 300.00

Since L = D + 450, this formula becomes:

.09*D + .06*(D + 450) = 300.00

Simplify this to get:

.09*D + .06*D + .06*450 = 300.00

solve for D that will be the cost of desktop add 450 to get the laptop cost

Answer 2

1820

Answer 3

thanks

Answer 4

yw