Answer:
25% decrease
Explanation:
To find percent of increase/decrease you can do the following:
take the difference of new and original values, divide it by the original value - this will give you a decimal
Multiply the decimal by 100 to change to a percent
So, (60-80) ÷ 80 = -20/80 which is -1/4 or -.25
25% decrease
the result will always be negative if there's a decrease in values and positive if there is an increase in before and after values