Question

n the first week of​ July, a record 1 comma 020 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, 140 more people went to the pool than in the second week. In the fourth​ week, 183 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?

Answer 1

Answer: 15%

Step-by-step explanation:

1) Percent decrease = (decrease / base value) × 100

2) Base value = number of people that went to the local swimming pool in the first week = 1,020

3) Decrease = net change in the number of people

• Week 1: 1,020 people
• Week 2: 1,020 - 110 = 910 people
• Week 3: 910 + 140 = 1,050
• Week 4: 1,050 - 183 = 867 people

Net change (decrease) = number of people that went in the first week - number of people that went in the fourth week = 1,020 - 867 = 153 people

Note that this number, 153, is equal to the sum of the changes: 183 + 110 - 140 = 153

5) % decrease = (153 / 1,020) × 100 = 15% ← answer