Answer:
Step-by-step explanation:
The subject B would be the experimental group in this scenario. This is because they were subjected to the new itching powder to test if it was better than his regular one and that would make the subject A the control group. When he compared the two results he saw that the experiment was a success and that the new powder really did work but instead of 50% longer lasting itches, it had 100% longer lasting itches since 60 is 100% more than 30 minutes and 50% is 45minutes.