An appliance rated 400W is used for 8hrs. Another appliance rated at 750W is used for 2hrs. Find the cost of using these appliances for 30 days, if the cost of using 1kwh is ₹3.
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400W - 8hrs
750W - 2hrs
cost of 1kwh - Rs.3
30 days = 30×24
= 680 hrs
400W - 8hrs
x - 680hrs
x = 400×680/8
x = 34 kwh
1kwh = Rs. 3
34kwh = Rs. x
x = 34×3
x = Rs. 102
750W - 2hrs
cost of 1kwh - Rs.3
30 days = 30×24
= 680 hrs
400W - 8hrs
x - 680hrs
x = 400×680/8
x = 34 kwh
1kwh = Rs. 3
34kwh = Rs. x
x = 34×3
x = Rs. 102
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