What will be the ratio of simple interest earned by certain amount at the same rate of interest for 12 years and for 18 years?

What will be the ratio of simple interest earned by certain amount at the same rate of interest for 12 years and for 18 years?
Answer: 2 : 3

Simple interest is calculated as SI = PRT/100, where P is principal, R is rate, and T is time. For 12 years, SI₁ = PR(12)/100; for 18 years, SI₂ = PR(18)/100. The ratio is SI₁ : SI₂ = 12PR : 18PR = 12 : 18 = 2 : 3. Studying this highlights interest calculations, providing lessons on financial mathematics for planning investments.