The cost of 5 pens and 8 pencils is Rs. 131. If the cost of a pen is increased by Rs. 2.50 and that of a pencil is decreased by 50 paise, then the cost of 6 pens and 7 pencils becomes Rs. 157. What is the original cost (in Rs.) of 7 pens and 2 pencils?
1
130
2
142
3
135
4
132