A value is increased by 50%, decreased by 20%, and then increased by x%. After all changes, the final value is double the original. What is the value of x? (Round off your answer to two decimal places.)

In a town with 30,000 professionals, teachers make up 11% of the total professionals. If 46% of teachers are male, what is the number of female teachers in the town?

In a town's professional breakdown, doctors represent 18% and clerks represent 8% of the total professionals. If the number of doctors is 3000 greater than the number of clerks, what is the total number of professionals in the town?