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