Invest Ksh 500,000 at National Bank of Kenya for 15 years.
At National Bank of Kenya's current weighted-average deposit rate of 7.92%, a Ksh 500,000 deposit grows to about Ksh 1,633,867 after 15 years — about Ksh 1,133,867 in interest, assuming monthly compounding and no withdrawals.
Final balance
Ksh 1,633,867
3.27× your deposit
Deposited
Ksh 500,000
One-off, no withdrawals
Interest earned
Ksh 1,133,867
At 7.92% 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.