Tips & Tricks A = P(1 + r/100)n ⇒ 3600 = 2400(1 + r/100)6 ⇒ (1 + r/100)6 = 3/2 For 12 years, ⇒ A = 2400(1 + r/100)12 ⇒ A = 2400[(1 + r/100)6]2 ⇒ A = 2400 × (3/2)2 = Rs. 5400 ∴ The amount after 12 years at the same rate of interest will be Rs. 5400. Short trick, The amount after 12 years = (3600 × 3600)/2400 = Rs. 5400