Question

the strength of a school increased by 20% in one year and decreased by 20% in the next year is the final strength greater or less than the original one and by how much percent

Answer 1

suppose strength= 100
first year increase by 20% , total strength is=120
second year decrease by 20%, total strength decrease =24
total strength 2nd year is= 120-24=96
strength decreases by 4% against first year

Answer 2

Answer:

Step-by-step explanation:

Let strength be 100%

Strength increased in 1st year=100%+20%=120%

Strength in 2nd year=20% of 120=24%

Final strength=100%-(120-24)%

                      =>100%-96%=4%

So the final strength is less than the original strength by 4%