Final answer:
The percent of increase in the amount of soap used by Clean Machine from last year to this year is 20%.
Step-by-step explanation:
To calculate the percent of increase in the amount of soap used by Clean Machine from last year to this year, we need to find the difference between the two amounts and then divide it by the original amount. Finally, we multiply the result by 100 to get the percentage.
The formula to find the percent of increase is:
Percent Increase = ((New Amount - Original Amount) / Original Amount) x 100
Plugging in the values given:
Percent Increase = ((2,664 gallons - 2,220 gallons) / 2,220 gallons) x 100
Percent Increase = (444 gallons / 2,220 gallons) x 100
Percent Increase = 0.20 x 100
Percent Increase = 20%
So, the percent of increase in the amount of soap used by Clean Machine this year is 20%.