Mukund invests a sum of ₹5400 and Sachin invests a sum of ₹9400 at the same rate of simple interest per annum. If, at the end of 5 years, Sachin gets ₹960 more interest than Mukund, then find the rate of interest per annum (in percentage).
A3.8
B6.8
C2.8
D4.8
