; Typical financial problem.

; Find how long it takes to reduce the balance to $100000 on a mortgage
; for a $150000 house if the down payment is $20000, the rate is 13%,
; and the montly payment is $2000.

   dnpay = 20000            ; down payment
   house = 150000           ; price of house
   balance = FVAL(mrate,months,-2000,house-dnpay)
   mrate = yrate / 12       ; monthly rate
   years = months / 12      ; time in years
   yrate = 0.13             ; yearly rate
   balance = -100000        ; negative, since money is owed
   years := 10              ; guess, in years
   months := 120            ; guess, in months
   DIGITS 10