Answers

2016-04-13T21:48:28+05:30
1 bulb power= 50W
so, 10 bulbs = 10*50=500W

1 fan power= 70W
so, 5 fans = 70*5=350W

both the appliances are operated for the same time
total power = 500+350
                  = 850W
                   = 850/1000 kW

Time = 12 hours

units of electricity = power * time (it is actually kW*t)
                             = 850/1000 * 12
                             =17/5 * 3
                             =3.4 * 3
                             =10.2 kWh

1 unit = Rs.2
so, 10.2 kWh = 10.2 * 2
                      = Rs.20.4 

If there's any mistake pls inform in the comment
0
it's actually 10.2 kWh.. I typed by mistake