Task: Question Answering
Input (English): Problem: an engineer undertakes a project to build a road 10 km long in 300 days and employs 30 men for the purpose . after 100 days , he finds only 2 km of the road has been completed . find the ( approximate ) number of extra men he must employ to finish the work in time . 
Options: a ) 20 , b ) 25 , c ) 30 , d ) 35 , e ) 40
Output (English): c