In the Venn diagram given below, the 'Circle' represents 'Officers', the 'Triangle' represents 'Married', the 'Rectangle' represents 'Salary above Rs. 50,000' and the 'Square' represents 'Post-Graduates'. The numbers given in the diagram represents number of persons of that particular category. How many single officers have salary above Rs. 50,000 but do NOT have a post-graduate degree?