Question

principal=₹6400,SI=₹1152and rate=8%p.a.

Answer 1

    si=p×r×t/100
or,1152 = 6400×8×t / 100
or,8t = 18
or,t=18/8 =9/4 
               =2 1/4
               =2 years 3 months

Answer 2

T = 100 * SI/P*R
= 100*1152/6400*8
= 115200/51200
= 2 1/4

Ans is 2 year 3 months.