here we have businesses.

Now, they are divided into two major categories: per type (one or more ownership) and per fields (automotive, agriculture, and so forth)

we want to know how many of those in the household sales field are are joint venture which imply that are NOT sole ownership (only male or female who conducts the business).

Now, the stem tells you that we do have 7 female and 4 males which added gives to us 11 sole unique owner.

You do not need either calculation here: because 11 is a vast minority of the businesses among the type of business we have in total 39 for households among fields and 11 among the types it is reasonable to infer that the jointventure are the vast majority.

Because the answer choices are up to 42% and then 72%. The majority is 72%

Just with observation.

I hope this helps