You are going to join a gym and there are two options close to your workplace. Gym A charges you a flat rate of $39.95 per month. Gym B charges you $14.95 per month plus $2.95 per visit.
You would want gym b. Gym B would only come to $23.80 per month (that's going off 30 days, but with 31 days it would still be cheaper). So if you had to pick 1,Gym B would be cheaper.