AComputing for monthly amortization
A= (Pr(1+r)^n) /((1+r)^n-1)
where
P= $20000
r = 9%/12 months
=0.75%/month= 0.0075
n= 2years*12
=24 payments
A= $769.42
Jimenez family will pay $769.42 in 2 years to payoff the loaned amount
b. This problem type is called Amortization