Solution:
1. We have to use financial calculator to solve this
put in calculator -
PV -30000
FV 60000
PMT 0
I 8%
Compute N 9
Therefore It will take 9 years to reach his goal
2. We have to use financial calculator to solve this
put in calculator -
PV -28700
FV 0
PMT 7000
N 5
Compute I 7.00%
The interest rate implicit in this agreement rate =7.00%
3. We have to use financial calculator to solve this
put in calculator -
PV -10000
FV 0
I 9%
N 10
compute PMT $1,558.20
The annual payment Sam must make to pay back his friend = $1,558.20