in how much time will the simple interest on rs 800 at 12.5% per annum be rs 125 Share with your friends Share 1 Varun.Rawat answered this We have,Principal, P = Rs 800Rate, R = 12.5% p.a.Time, T = ?SI = Rs 125⇒PRT100 = 125⇒800 × 12.5 × T100 = 125⇒100T = 125⇒T = 125100 = 54 yrs = 54×12 months = 15 months 1 View Full Answer Arnav Aggarwal answered this 1.25 years 1 Sriram answered this SI= 125 R = 12.5% P= 800 T= 100 x SI/ P x R = 100 x 125/800 x 12.5 = 5/4 = 1 1/4 years = 1 year and 91.25 days 0