Answer:
Fred's Fit Place: 4 month membership every trimonthly
Explanation:
Fred's Fit Place is less expensive first of all.
Secondly, You could by a one month membership every month, a two month membership every 6 months, a three month membership every 4 months or a 4 month membership trimonthly. If you do the math, the 4 month membership trimonthly is least expensive.