Answer:
15%
Step-by-step explanation:
Given that,
Initial earning is $20 for each lawn and this summer she raised her price to $23 per lawn. We need to find the percent increase of peggy's charges. It can be given by :
[tex]P=\dfrac{|\text{initial-final}|}{\text{initial}}\times 100[/tex]
Putting the values in above formula, we get :
[tex]P=\dfrac{|20-23|}{20}\times 100\\\\P=15\%[/tex]
So, there is 15% increase in the peggy's charges.