Simple Interest (SI)=( Principal × Rate × Time )∕100 Calculation: Let the rate of interest be R%. Interest for Amit =(5400×R×6)∕100 Interest for Gopal =(9400×R×6)∕100 Difference in interest = Interest for Gopal - Interest for Amit ⇒ ₹ 960=[(9400×R×6)∕100]−[(5400×R×6)∕100] ⇒ ₹960 =[(9400−5400)×R×6]∕100 ⇒ ₹960 =[(4000×R×6)∕100] ⇒₹960×100=4000×R×6 ⇒96000=24000×R ⇒R=96000∕24000 ⇒R=4