Question

An electric refrigerator rated 400w is used for 8 hours a day an electric iron box rated 750w is used 2 hours a day .Calculate the cost of using these appliance for 30 days if the cost of 1kwh is rs 3%

Answer 1

Answer:

14.1 %

Explanation:

total power consumed = 400 x 8 + 750 x 2 = 3200 + 1500 = 4700 W

cost of electricity = p x t (in hours) /1000

cost of electricity in kwh  = 4700 / 1000 = 4.7 kwh

cost of 1 kwh = 3 % = 0.03 rs

cost 4.7 kwh = 0.03 x 4.7 = 0.141 rs = 14.1 %