Question

Find the simple interest on 654.88 @ 21/4%p.A for 1 year and 3 months

Answer 1

firstly for to solving short we add both interests in %
first year + 3 months (as a 1/4 part of 12 months so rate will be division by 1/4 and time will be multiplied by 1/4)
total interest = 21/4% + 21/4/4×3% = 5.68%
so now given principal amount = 654.88
then let be 100%= 654.88
then s.i.= 654.88/ 100%×5.68%= 37.19 rupees