Answer:
The percentage increase when Mrs.Lay’s instagram followers went from 40 to 72 is 80%
Solution:
The percentage increase can be found out by dividing change in value by initial value. This is given as,

From question, we get
Initial count of Mrs.Lay = 40
Final value of Mrs.Lay = 72
So percentage increase when Mrs Lay’s Instagram followers went from 40 to 72 is



= 80
Hence percentage increase when Mrs Lay’s Instagram followers went from 40 to 72 is 80%.