Answer: 20%
Explanation:
Using the midpoint formula, the denominator is an average of the beginning and ending figures;
= [tex]\frac{Q2 - Q1}{Q2 + Q1 /2 } * 100[/tex]
= [tex]\frac{110 - 90}{(110 + 90)/2} * 100[/tex]
= [tex]\frac{20}{100} * 100[/tex]
= 20%