Invest Ksh 10,000,000 at Development Bank of Kenya for 20 years.
At Development Bank of Kenya's current weighted-average deposit rate of 10.83%, a Ksh 10,000,000 deposit grows to about Ksh 86,389,784 after 20 years — about Ksh 76,389,784 in interest, assuming monthly compounding and no withdrawals.
Final balance
Ksh 86,389,784
8.64× your deposit
Deposited
Ksh 10,000,000
One-off, no withdrawals
Interest earned
Ksh 76,389,784
At 10.83% p.a.
Year by year
Contributions form the floor; interest compounds on top.
Could you earn more elsewhere?
The same Ksh 10,000,000 in Cytonn Money Market Fund — currently Kenya's top-yielding MMF at 9.39% net of 15% WHT — would grow to about Ksh 64,927,777 over the same 20 years. Run your own numbers on the compound interest calculator.