Question 1031249
let principal be x
 and interest be y

x+y = 550

y = (2/9) x

9y=2x

9x+9y = 4950

9x+2x= 2950

11x = 4950

x= 450

y = 100

100 in 5 years
20 in 1 year

On Rs 450 interest = 20 for 1 year

rate (100/450) * 20 = 4.44 %