$100 Invested at 10% for 3 Years
$134.82
Future Value (compounded monthly)
$100 invested at 10% annual compound interest (compounded monthly) for 3 years will grow to $134.82. You earn $34.82 in interest. At 10%, your money doubles in approximately 7.2 years (Rule of 72).
Year-by-Year Growth
| Year | Balance | Interest |
|---|---|---|
| 1 | $110.47 | $10.47 |
| 2 | $122.04 | $22.04 |
| 3 | $134.82 | $34.82 |
Quick Reference Table
| Principal | Rate | Years | Future Value |
|---|---|---|---|
| $100 | 8% | 3 yrs | $127.02 |
| $100 | 9% | 3 yrs | $130.86 |
| $100 | 11% | 3 yrs | $138.89 |
| $100 | 12% | 3 yrs | $143.08 |
| $100 | 10% | 1 yrs | $110.47 |
| $100 | 10% | 2 yrs | $122.04 |
| $100 | 10% | 5 yrs | $164.53 |
| $100 | 10% | 7 yrs | $200.79 |
| $100 | 10% | 10 yrs | $270.70 |
| $100 | 10% | 15 yrs | $445.39 |
Formula Used
A = P(1 + r/n)nt
- P = $100
- r = 10% = 0.1
- n = 12 (monthly)
- t = 3 years
- A = $134.82
Frequently Asked Questions
How much will $100 grow at 10% compound interest in 3 years?
$100 grows to $134.82. Interest earned: $34.82.
How long to double $100 at 10%?
Using the Rule of 72: 72 ÷ 10 ≈ 7.2 years.
What is the compound interest formula?
A = P(1 + r/n)^(nt). P=$100, r=10%=0.1, n=12, t=3.