Answer:
96 people.
Explanation:
Exponential equation for a decreasing amount:
The exponential equation for a decreasing amount is given by:

In which A(0) is the initial rate and r is the decay rate, as a decimal.
Currently, the number of people entering a shopping mall is 109.
This means that

It is estimated that the number of people entering the shopping mall will decrease by 3% each hour.
This means that

So



Find the total number of people entering the shopping mall at the end of 4 hours.
This is A(4). So

Rounding to the nearest whole number, 96 people.