#
calculate the electricity bill amount for a month of 31 days if the following devices are used as specified, Given rate of electricity is rupees 2.50 per unit.

a) 3 bulbs of 40 watts for 6 hours

b) 4 tube lightsof 50 watts for 8 hours

*(please mention each step how multiplied and so on )

(1)There are 3 bulbs of 40 watts that means 120 watts per hr . And for 6 hrs 120x60= 720 for 6 hrs a day. And for 31 days 31x720 = 22320 that means 22.3 units.

(2) In the same way 4x50x8x31 = 49600 or 49.6 units

Total units = 71.9 (approx)

Rupee @ 2.50/unit = 179.8 or 180....

Thanks..........

**
**