At a work centre, two types of jobs are to be done - 'A' and 'B'. 'A' needs a setup time of 20 minutes, and a per piece time of 3 minutes. 'B' needs a setup time of 25 minutes, and a per piece time of 2 minutes. They have been alternating between ten units of A and ten units of B. 

Instead, if they alternate between 50 units of A and 50 units of B, what is the percentage increase in productivity? (Both A and B are priced equal, so for the total output, you can add the two; you can assume a continuous 24 hour operation)