Al must build 25 radios before he receives $20. what schedule of reinforcement is being used?

a variable-ratio schedule

a continuous schedule

a fixed-ratio schedule

a fixed-interval schedule

a partial-interval schedule

"A fixed-ratio schedule" is the one schedule of reinforcement among the following choices given in the question that is being used. The correct option among all the options that are given in the question is the third option. I hope that this is the answer that has actually come to your desired help.