Answer:

Step-by-step explanation:
we know that
The simple interest formula is equal to
where
A is the Final Investment Value
P is the Principal amount of money to be invested
r is the rate of interest
t is Number of Time Periods
in this problem we have
The inequality that represented this situation is

substitute the values and solve for t


![t \leq [(7,020/4,500)-1]/0.03](https://tex.z-dn.net/?f=t%20%5Cleq%20%5B%287%2C020%2F4%2C500%29-1%5D%2F0.03)

The solution is where the lines cross. So your x coordinate is 3.Click to let others know, how helpful is it
9% of $2500 = 225
7 × 225 + 2500 = $4075
4 out of 5 went to potential members, so 1/5 of the total went to existing members.
(1/5)·215 = 43 . . . . went to existing members
35+(-10)= 25
Hope i helped!