Question

An electric bulb of 75 W burn for 4 hour a day what will be the cost of electricity involve in a month of 30 day at 2.5 ₹ per unit

Answer 1

75×4 ×30÷1000=9
1 unit =2.5 Rs
9×2.5=22.5 Rs

Answer 2

Total hrs working=4*30=120 hrs

Total consumption=75*120=9000watt*hr

I.e. 9 kwhr.

Since 1unit =1kwh for electricity bill

So bill= 2.5*9=22.5₹

(Ab bill kam aya ...It's right ans☺️ hope u never mind)