In a huge Jewellary shop, the electric gadgest being used are 17 tubelights of 40 W each, 14 fans of 80 W each, 16 bulbs of 60 W each, 11 bulbs, of 100, W each, 11 AC, s or 2100 W each, 9 laptops of 200 W each and 10 TV of 120 W each. In a day. Tube lights and TV's are used for 8 h but 60 W bulbs are sued for 7 h and 100 W bulbs are used for 9 h whears laptons and AC's are used for 5 h and 9 h respectively. However, fans are used for 11h. (Note 100W=1 unit, 1 mons =30 days )
What is the total electric energy consumed (in unist) by 60 W bulbs in the whole month ?

Options

A. Rs. 27368
B. Rs. 28683
C. Rs. 78600
D. Rs. 2900

Answer

A

Explanation

One unit cost =RS2.70.
Power (used by AC's) Unit cost =RS3.70
Electricity ocnsumed by all equipment (except AC's)
`=(201.6+369.6+270+163.2+288+297)` unit
`=(1292.4+297.00)" unit "=1589.4` unit
Cost for these unit `=1589.4xx2.7=4291.38`
Electricity consumed by AC's
`=11xx2100xx9xx30W=623700W=6237` Unit
Cost for it `=6237xx3.7=23076.9`
Total cost `=23076.9+4291.38=RS27368`