Invest Ksh 500,000 at Diamond Trust Bank Kenya for 15 years.
At Diamond Trust Bank Kenya's current weighted-average deposit rate of 8.43%, a Ksh 500,000 deposit grows to about Ksh 1,762,850 after 15 years — about Ksh 1,262,850 in interest, assuming monthly compounding and no withdrawals.
Final balance
Ksh 1,762,850
3.53× your deposit
Deposited
Ksh 500,000
One-off, no withdrawals
Interest earned
Ksh 1,262,850
At 8.43% p.a.
Year by year
Contributions form the floor; interest compounds on top.
Could you earn more elsewhere?
The same Ksh 500,000 in Cytonn Money Market Fund — currently Kenya's top-yielding MMF at 9.39% net of 15% WHT — would grow to about Ksh 2,033,728 over the same 15 years. Run your own numbers on the compound interest calculator.