a techno company has 14 machines of equal efficiency in its factory . the annual manufacturing costs are rs 42000 and establishment charges are rs 12000 . the annual output of the company is rs 70000 . the annual output and manufacturing costs are directly proportional to the number of machines . the shareholders get 12.5 profit , which is directly proportional to the annual output of the company . if 7.14 machines remain closed throughout the year , then the percentage decrease in the amount of profit of the shareholders would be :
Choose the correct choice: A) 12 % B) 12.5 % C) 13.5 % D) 13 % E) 14 %

Rationale: explanation : the original profit is : - = > 70000 − 42000 − 12000 = 16000 . if 7.14 % of 14 i . e . one of the machines closed throughout the year , then the change in profit will be : - = > ( 13 / 14 ) × [ 70000 − 42000 ] . = > 14000 . thus , decrease in the profit % is : - = > ( 2000 / 16000 ) × 100 . = > 12.5 % . answer : b
Answer: B