The regular monthly fee without coupon is $ 50
<em><u>Solution:</u></em>
Given that, Chelsey wants to join a fitness club
With the coupon, her total cost for the 6 months is $225
Therefore,
With coupon cost for 6 months = 225
She has a coupon that will give her $12.50 off the monthly rate for the first 6 months
Therefore,
For 6 months, coupon gives a off of,

Therefore,
Without coupon cost = 225 + 75 = 300
Thus the regular monthly fee without coupon is:

Thus regular monthly fee without coupon is $ 50