Invest Ksh 10,000,000 at Guaranty Trust Bank for 10 years.
At Guaranty Trust Bank's current weighted-average deposit rate of 8.01%, a Ksh 10,000,000 deposit grows to about Ksh 22,218,463 after 10 years — about Ksh 12,218,463 in interest, assuming monthly compounding and no withdrawals.
Final balance
Ksh 22,218,463
2.22× your deposit
Deposited
Ksh 10,000,000
One-off, no withdrawals
Interest earned
Ksh 12,218,463
At 8.01% 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 25,480,929 over the same 10 years. Run your own numbers on the compound interest calculator.