The concepts of simple interest and compound interest?

Answer 1

With simple interest, you just multiply the capital, the number of years, and the yearly interest rate. For example, for a capital of 10,000 dollars, 3% interest, 10 years, that would give you 10,000 x 3/100 x 10 = 3,000 dollars interest.

With compound interest, after the end of every year, the interest is added to the capital, before calculating the interest for next year.

In the example above, the first year you get 10,000 x 0.03 = 300 dollars. This is then added to the capital, before calculating the interest rate for the next year; so, the second year you get 10,300 x 0.03 = 309 dollars interest.