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An appliance is 80% efficient and runs for 4 hours, putting out 0.35 kW-h of energy. There are 2 electricity companies to choose from & you want the best deal. Company A charges 40 cents per Wh & Company B charges 45 cents per Wh. How much does the appliance cost under each company’s plan? How much money do you save under the better plan?

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temdan2001

Answer:

Company A = 56 cents

Company B = 63 cents

Money saved = 7 cents

Explanation:

Given that Company A charges 40 cents per Wh. And putting out 0.35 kW-h of energy for 4 hours

Electricity cost = 0.35 × 4 × 40

= 56 cents

Company B charges 45 cents per Wh

Electricity cost = 0.35 × 4 × 45

Electricity cost = 63 cents

Money saved = 63 - 56 = 7 cents.

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