RRB RPF RPSF SI and CONS Model Papers 7 with solutions

(4) If the principal be Rs. x and rate of interest be r% per annum, then
SI after 1 year = 920 – 880 = Rs. 40
∴ SI after 2 years = Rs. 80
⇒ 880 = x + 80
⇒ x = Rs. (880 – 80) = Rs. 800