an electric refrigerator rated 400 watt is used for 8 hours a day .An electri iron box rated 750w is used 2 hours a day . Calculate the cost of using these appliances for 30days,if the cost of 1kwh is Rs.3/-
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Rs423
Step-by-step explanation:
eneargy consume by refri....in 8h=400*8/1000=3.2kwh
by iron=750*2/1000=1.5kwh
total eneargy comsumed in day=3.2+1.5kwh=4.7kwh
total energy condumed in 30 days=30*4.7=141kwh
cost for appliances in 30day
=141*3=423
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