Menna meka base karan mama kiwwe.
Got it

Let’s carefully check this investment plan.
You said:
- Investment term: 2 years (24 months)
- Bank promises: LKR 500,000 at the end
- Your monthly installment: LKR 19,000
- Stated annual interest rate: 9%
Step 1: Total money you invest
19,000×24=456,000 LKR19,000 \times 24 = 456,000 \text{ LKR}19,000×24=456,000 LKR
So, you deposit
LKR 456,000 in total.
Step 2: Final return
You receive
LKR 500,000 at maturity.
Profit = 500,000−456,000=44,000500,000 - 456,000 = 44,000500,000−456,000=44,000
Step 3: Effective return
44,000456,000≈9.65% total (2 years)\frac{44,000}{456,000} \approx 9.65\% \text{ total (2 years)}456,00044,000≈9.65% total (2 years)
Annualized return:
(500,000456,000)12−1≈4.7% per year\left(\frac{500,000}{456,000}\right)^{\tfrac{1}{2}} - 1 \approx 4.7\% \text{ per year}(456,000500,000)21−1≈4.7% per year
Step 4: Compare with stated 9%
- Bank says 9% annual, but your effective yield is ~4.7% annual.
- This happens because you are depositing in monthly installments, not as a lump sum. The first installments stay invested longer, later ones much shorter. So the actual effective rate is lower.
Verdict:
- You are getting profit, but not a true 9% annual yield.
- Actual benefit ≈ 4.7% per year, which is much lower than fixed deposits in Sri Lanka right now (often above 8–10% for 1 year).
- So, not really worth it unless you prefer the disciplined savings method (forced monthly saving + lump sum maturity).