What is the rate of simple interest for the first 4 years if the sum of Rs. 360 becomes Rs. 540 in 9 years and the rate of interest for the last 5 years is 6%?

• ক 0.04
• খ 0.06 ✅ সঠিক উত্তর
• গ 0.03
• ঘ 0.035