Preston's clock produces 45 useful energy units for every 100 units of electricity used. what is the efficiency of the clock? 0.45 percent 45 percent 55 percent 100 percent

The correct answer is - 45 percent.

Since the clock produces 45 useful unites energy units for every 100 unites of energy that it uses, than it turns out that the efficiency of the clock is 45 percent.

The efficiency of the clock Is 45 percent

Explanation:

The formula to calculate efficiency is: output divided by input and the result should be multiplied by one hundred or output/input x 100. In this case, we will say 45/100 which gives us .45 this has to be multiplied by 100 to obtain the percentage. .45 multiplied by 100 is 45%. That is the reason behind our answer.