On a particular day, the following appliances are used for the times indicated; coffee maker, 40 min., and microwave oven, 12 min. The power requirements for both are 1650 W and 1250 W. If the electrical cost is 8 cents per kWh. How much does it cost to use the appliances?

Question

anonymous · Answer

For coffee maker, 
 1650 * 40 W/min
1650*40/(1000*60)  KWH
=>1.1kWh
Now,
1kWh---->8cents
1.1kWh---->8*1.1 cents =8.8 cents

anonymous · Answer

It costs 8.8 cents to use coffee maker. Now calculate for microwave oven