Given: Principal = Rs. 12000 Rate of interest = 10% No. of half years = 2 Formula Used: Amount (A)=P[1+100R]n Where, P = Principal, R = Rate, n = Time (in years) Calculation: According to the question ⇒ Amount =12000×(1+100210)2 ⇒ 12000×(1.05)2 ⇒ 12000 × 1.1025 ⇒ 13230 ∴ Interest earned = Rs. (13230 - 12000) = Rs. 1230