Bob bought two computers, one desktop and one laptop. Before finance charges, the laptop cost $1000 less than the desktop. Bob paid for the computers using two different financing plans. For the desktop the interest rate was 6% per year, and for the laptop it was 9.5% per year. The total finance charges for one year were $641.25 . How much did the desktop computer cost before finance charges?
I have no idea where to start. Anyone care to guide me through this?