Question

a sum amounts to $ 3605 in 219 days at 5% per annum.the sum is

Answer 1

Amount = Rs.3605
Rate = 5% per annum 
Time = 219 days or 219/365 (in years)
Let Principal be x
Simple Interest = PRT/100 which is x*5*219/100*365=3x/100
3x/100 + x =3605
=> 103x=360500
=> x=360500/103
Therefore Principal = Rs.3500