To determine the interest as a percentage, we will use the following expression:
[tex]\frac{final\text{amount}}{inital\text{amount}}\times100-100.[/tex]In this case, final amount = 140, and initial amount = 120. Substituting these values in the above expression, we get:
[tex]\frac{140}{120}\times100-100.[/tex]Simplifying the above result, we get:
[tex]\frac{140}{120}\times100-100\approx16.67.[/tex]Answer: 16.67%.
