Vipul invests a sum of ₹5400 and Vijay invests a sum of ₹9400 at the same rate of simple interest per annum. If, at the end of 5 years, Vijay gets ₹840 more interest than Vipul, then find the rate of interest per annum (in percentage).
1
4.2
2
2.2
3
3.2
4
6.2