Jamal joined his local gym. A yearly membership costs $624, including a $66 registration fee and 12 equal monthly payments. what is the monthly payment

To find the monthly payment, we need to subtract the registration fee from the total cost and then divide by the number of months.

The total cost of a yearly membership is $624.
The registration fee is $66.
So, the cost of membership without the registration fee is $624 - $66 = $<<624-66=558>>558.
There are 12 equal monthly payments, so the monthly payment is $558 / 12 = $<<558/12=46.50>>46.50. Answer: \boxed{46.50}.