Given: Rs. 4000 invested at SI for 3 years CI – SI = Rs. 455 Amount on SI after 3 years = Rs. 5200 Formula used: Let P = principal, R = rate of interest and N = time Simple Interest =
PNR
100
Compound interest = P(1+
R
100
)n – P Calculation: Simple Interest = 5200 – 4000 = Rs. 1200 ⇒ 1200 = 4000 × R ×