A 12 HP motor has to be operated 8 hours/day. How much will it cost at the rate of 50 paisa/kWh in 10 days (in Rs)

If a motor of 12 HP works for 10 days at the rate of 8 hr/day then energy consumption = power × time =12×746Jsec×(80×60×60) sec=12×746×80×60×60 J = 2.5 × 109 JRate of energy = 50paisakWhi.e. 3.6×106J energy cost 0.5 RsSo 2.5 × 109 J energy cost = 2.5×1092×3.6×106=348 Rs