Answer: There is 23.07% of decrease.
Step-by-step explanation:
Since we have given that
Charges at night during the summer = $52.00
Charges at night during a fall = $40.00
Decrease in charges is given by
[tex]\$52.000-\$40.00\\\\=\$12.00[/tex]
So, Percentage of decrease is given by
[tex]\dfrac{12}{52}\times 100\\\\=23.07\%[/tex]
Hence, there is 23.07% of decrease.