The ticket charges at a multiplex cinema hall are reduced by 25%. As a result, the attendance in the cinema hall increases by 10%. Find the net percentage change in the revenue earned by the cinema hall.

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?