Invest Ksh 5,000,000 at Prime Bank for 20 years.
At Prime Bank's current weighted-average deposit rate of 10.39%, a Ksh 5,000,000 deposit grows to about Ksh 39,586,712 after 20 years — about Ksh 34,586,712 in interest, assuming monthly compounding and no withdrawals.
Final balance
Ksh 39,586,712
7.92× your deposit
Deposited
Ksh 5,000,000
One-off, no withdrawals
Interest earned
Ksh 34,586,712
At 10.39% 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.