A person decided to build a house in 100days. He employed 100men in the beginning and 100 more after 20 days and completed the construction in stipulated time. If he had not employed the additional men , how many days behind schedule would it have been finished?  Pick:
A) 40  B) 80  C) 70  D) 60  E) 50
200 men do the rest of the work in   100-20= 
<gadget id="calculator">  100-20</gadget>
<output>80</output>
80days   100 men can do the rest of the work in 80*200/100= 
<gadget id="calculator">80*200/100</gadget>
<output>160</output>
160days   Required number of days= 160-80= 
<gadget id="calculator">160-80</gadget>
<output>80</output>
80 days   Answer is 80
<result>B</result>
A person decided to build a house in 100days. He employed 100men in the beginning and 100 more after 20 days and completed the construction in stipulated time. If he had not employed the additional men , how many days behind schedule would it have been finished?