A new shopping mall is gaining in popularity. Every day since it opened, the number of shoppers is 20%, percent more than the number of shoppers the day before. The total number of shoppers over the first 4 days is 671.
How many shoppers were at the mall on the first day?
Round your final answer to the nearest integer.

There were 125 shoppers on the first day.

Step-by-step explanation:

Let us call the number of shoppers on the first day , then on the nth day the number of shoppers is

which is a geometric series whose sum to the nth term is

Now, we know that the total number of shoppers over the first 4 days is 671; therefore,

Thus, there were 125 shoppers on the first day.

y=mx+b

step-by-step explanation:

m is slope, b is y-intercept