Suppose you deposit $150 in a savings account that earns simple interest at a rate of 5.5% per year. How much interest will you earn after 4 years?

With simple interest, you only earn 5.5% of the original $150 each year.

So after 4 years, your money will earn (5.5% x 4) = 22% of the original $150.

22% of $150

= 0.22 x $150

= $33.