How much time will it take for an amount of Rs. 450 to yield Rs. 81 as interest at 4.5% per annum of simple interest?

Given

• Principal P = Rs. 450
• Simple interest SI = Rs. 81
• Rate r = 4.5% p.a.

Time via simple interestSI = 𝑃 × 𝑟 × 𝑡 100 100 P×r×t ​ ⇒ 81 = 450 × 4.5 × 𝑡 100 100 450×4.5×t ​ 81 = 20.25t ⇒ t = 81 20.25 20.25 81 ​ = 4 years