How to calculate Interest percentage

Sir I need you help and it's urgent.
last month maine ek scooty purchase ki the jiske cost 88,000 ki the. aur maine scooty fiance pe le hai.
so sir mujhe interest percentage calculate karna hai to vo kaise hoga

cost of scooty :- 88,000
Down Payment :- 30,000
aur mai emi pay kr raha hu is month se aur maine do saal tak ke liye fiance kr rakhi hai aur is month se mai every month bank accounts se pay kr raha hu
3,211
so mere question yeh hai ki Sir yeh 3,211 kaise calculate kiya gaya hai aur yeh Interest percentage kaise calculate hoga.