### Home > CCAA > Chapter 7 Unit 6 > Lesson CC2: 7.1.3 > Problem7-33

7-33.

A homeowner must reduce the use of his home’s electricity. The home currently consumes $25.7$ kwh (kilowatt hours) of electricity per day, and the homeowner must reduce the use by $20\%$. Find the amount of electricity that will be used after the reduction in two different ways, using two different scale factors.  Homework Help ✎

Find $20\%$ of the amount of electricity used.

$\frac{20}{100}=\frac{x}{25.7}$

Once you have found the amount of reduction, subtract that from the original amount of power consumption.

$25.7-5.14=20.56$ kwh
If you reduce the use of electricity by $20\%$, what percentage is left?