Simply multiply the capital, the number of years, and the interest rate. Note: Presumably, the interest rate is a percentage, so you can express it as 0.04 or as 4/100.
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d 2.5 years
Depends on how you invested it and what rate of return that investment delivered.
1200
It is 630/(3*4200)*100% = 5%
simple interst is when you earn interest from your principal but compound interest is when you earn interest from your principal as well as from your previous interest