A drug company maintains that a new drug G for a certain disease has a 50% cure rate as compared with drug H. which has only a 25% cure rate You are asked to design a clinical trial comparing drugs G and H Using the preceding table, estimate the number of patients needed in each therapy group to detect such a difference with

α = 0.05, two-sided, and β = 0.20.

The number of patients needed in each therapy group is __________