Read the following Caselet and answer the questions:
There are three 3 types of stores namely retail, online and door to door and certain number of people were working in all these stores. Each person was working on one store or the other. 72% people were in retail stores. People working in door to door store only was 1/36 of the retail store. Person working in both the online and door to door store except retail store were 55. Person working in only online store is equal to person in door to door only + 65.
What is the total number of people working in online store only?

Options

A. 500
B. 120
C. 75
D. 140