Problem: if the length of a rectangle is increased by 10 % and the area is unchanged , then its corresponding breadth must be decreased by ? 
Options: ['a ) 9 1 / 19', 'b ) 9 1 / 15', 'c ) 9 1 / 16', 'd ) 9 1 / 11', 'e ) 9 1 / 10']
e