At a sale, Mohit paid Rs. 129.40 for 8 files and 4 pens. If a file and a pen costs Rs. 24.50 altogether, the cost of each pen is ______.
(A) Rs. 16.65
(B) Rs. 17.85
(C) Rs. 15.75
(D) Rs. 25
What is the answer
What is the answer