The difference in simple interest earned from scheme A and scheme B is Rs. 40.5. If Rs. 4500 is invested in scheme A for 3 years at R% p.a. and same amount is invested in scheme B for 3 years at r% p.a., then find the difference in the rate of interest applied.
1
0.3% p.a.
2
0.4% p.a.
3
0.5% p.a.
4
0.9% p.a.