To calculate the interest Robertha will earn in 3 years using the formula \( i = prt \), where:
- \( p \) is the principal (starting amount) = $60,000
- \( r \) is the interest rate expressed as a decimal = 8% = 0.08
- \( t \) is the time in years = 3
Now, plug the values into the formula:
\[ i = 60000 \times 0.08 \times 3 \]
Now, calculate it step by step:
-
Multiply the principal by the interest rate: \[ 60000 \times 0.08 = 4800 \]
-
Then multiply that result by the time in years: \[ 4800 \times 3 = 14400 \]
So, the total interest earned in 3 years will be:
\[ \boxed{14400} \]