Seventh grade
P.12 Simple interest ETY
Amanda has $\$ 900$ in a savings account that earns $15 \%$ annually. The interest is not compounded. How much interest will she earn in 2 years?
4) Use the formula $i=p r t$, where $i$ is the interest earned, $p$ is the principal (starting amount), $r$ is the interest rate expressed as a decimal, and $t$ is the time in years.
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Answer

Therefore, Amanda will earn $\boxed{270}$ in interest over 2 years.

Steps

Step 1 ：Use the formula for simple interest: $i = prt$

Step 2 ：Plug in the values: $i = 900 \times 0.15 \times 2$

Step 3 ：Simplify the expression: $i = 270$

Step 4 ：Therefore, Amanda will earn $\boxed{270}$ in interest over 2 years.