Invest Ksh 5,000,000 at Co-operative Bank of Kenya for 20 years.
At Co-operative Bank of Kenya's current weighted-average deposit rate of 6.44%, a Ksh 5,000,000 deposit grows to about Ksh 18,065,320 after 20 years — about Ksh 13,065,320 in interest, assuming monthly compounding and no withdrawals.
Final balance
Ksh 18,065,320
3.61× your deposit
Deposited
Ksh 5,000,000
One-off, no withdrawals
Interest earned
Ksh 13,065,320
At 6.44% p.a.
Year by year
Contributions form the floor; interest compounds on top.
Could you earn more elsewhere?
The same Ksh 5,000,000 in Cytonn Money Market Fund — currently Kenya's top-yielding MMF at 9.39% net of 15% WHT — would grow to about Ksh 32,463,888 over the same 20 years. Run your own numbers on the compound interest calculator.