Hour 1: 10 KW used for 0.5 hour = 5 KW (10 x 0.5) Hour 2: 20 KW used for 1 hour = 20 KW (20 x 1) Hour 3: 0 KW used for 1 hour = 0 KW (0 x 1) Hour 4: 30 KW used

Hour 1: 10 KW used for 0.5 hour = 5 KW (10 x 0.5) Hour 2: 20 KW used for 1 hour = 20 KW (20 x 1) Hour 3: 0 KW used for 1 hour = 0 KW (0 x 1) Hour 4: 30 KW used for 0.5 hour = 15 KW (30 x 0.5) TOTAL = 40 KW used x $10 ⇒ $40 Shouldnt that be 50kw used in total? Now we know who's writing all the bugs :)