Here, R1=R2=5%T1=4yrT2=3yr According to the question,
P×R×T1
100
−
P×R×T2
100
=Difference in SI
⇒
P×5×4
100
−
P×5×3
100
=42 ⇒
P
5
−
3P
20
=42 ⇒4P−3P=42×20 Thus, P=Rs840 Alternate Method If is the difference of interest obtained from two sources on Rs P int yr be Rs x. then the difference in rates of interest will be R=