### NRT SP test 12 question 9

A 3,600 Watts device consumes 3,6 KwH if it runs 1 hour. If the overall expense is given, GBP 135, and I know the cost of 1 kwh = GBP 0,9, then i can calculate how many KWH has been consumed = 135/0,9= 150 Kwh. So if the device consumes 3,6Kwh in 1 hour, then the amount of hours it has run are 150/3,6 = 41,67 hours. There are enough information to solve the problem. Your Explanation seems wrong.