Problem: the breadth of a rectangular field is 60 % of its length . if the perimeter of the field is 800 m . what is the area of the field ? 
Options: ['a ) 18750 sq . m', 'b ) 37500 sq . m', 'c ) 40000 sq . m', 'd ) 48000 sq . m', 'e ) none of these']
b