11years=132months. 9% p.a. is 9/12%=0.75% per month=0.0075.
Growth=1.0075^132=2.6813 approx, so 5000 grows to 13406.56 approx.
The interest=13406.56-5000=N$8406.56.
15%pa=0.0125pm; 0.0375pq; 0.075semiannually.
10 years=120 months; 40 quarters; 20 6-month periods.
Growth=4.4402, 4.3604, 4.2479 respectively.
Accumulated=66603.20, 74126.44, 76461.32 in N$.