On Sunday 845 people went to the Zoo. On Monday only 169 people went. What is the per cent decrease in the people visiting the Zoo on Monday?
On Sunday, number of people went to the Zoo = 845
On Monday, number of people went to the Zoo = 169
∴ Decrease in number of the people = 845 – 169 = 676
Decrease percent = 
= 80%
Hence, decrease in the number of people visiting the Zoo is 80%.
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