ANSWER:
The interest earned on a principle of $671.37 at an interest rate of 4% for four years is $ 107.42.
SOLUTION:
Given, p = $671.37, R = 4%, t = 4.
We need to find the simple interest for the above given values of amount, rate and years.
We know that
![Simple Interest $=\left((p * r * t)/(100)\right)$](https://img.qammunity.org/2020/formulas/mathematics/middle-school/6nulu0q9plhy6snbbpmiev9x4kuqpvz808.png)
where, p = principal amount ; r = rate of interest ; t = number of years
By substituting the values we get,
![=\left((671.37 * 4 * 4)/(100)\right) \\\\$=\left((2685.48 * 4)/(100)\right) \\\\$=\left((2685.48)/(25)\right)$$=107.4192$](https://img.qammunity.org/2020/formulas/mathematics/middle-school/ncfmtqloueh1v4vjl4akm4lra3yx4pg4ni.png)
Simple interest is $ 107.42 approximately.
Hence, the interest earned on a principle of $671.37 at an interest rate of 4% for four years is $ 107.42.