Wind turbines along a hilly ridge have recently been upgraded and currently have an average output of 564 kilowatt hours annually. that is 20% more than it was before the upgrades. what was the previous average output?



Answer :

The total number of eligible voters is 940. using percentage

What is the Percentage?
A number or ratio stated as a fraction of 100 is known as a % in mathematics (from the Latin per centum, "by a hundred"). Though the abbreviations "pct.", "pct.", and occasionally "pc" are also used, the percent symbol, "%," is frequently used to indicate it. A % is an irrational (pure) number that has no dimensions. this is percentage

Wind turbine gave an average output of 564 kwh after upgraded.
Which is 20% more before upgraded.
Let x before average output. than upgrade it will give x+x*20/100
So we have 6x/5 = 564
so x = 564*5/ 6
       = 470
Hence turbine give average output before upgrade is 470 kwh.

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