in the first week of july, a record 1040 people went to the local swimming pool. in the second week, 110 fewer people went to the pool than in the first week. in the third week, 130 more people went to the pool than in the second week. in the fourth week, 228 fewer people went to the pool than in the third week. what is the percent decrease in the number of people who went to the pool over these four weeks?

In July:

First week:

Number of people went to the local swimming pool =1040

Second week:

110 fewer people went to the pool than in the first week

so,

Number of people went to the local swimming pool =1040-110

=930

Third week:

130 more people went to the pool than in the second week

so,

Number of people went to the local swimming pool =930+130

=1060

Fourth week:

228 fewer people went to the pool than in the third week

so,

Number of people went to the local swimming pool =1060-228

=832

Decrease in number of people over four week= number of people in first week - number of people in fourth week

Decrease in number of people over four week=1040-832

=208

now, we can find percentage

Percentage is

=20%.........Answer