Answer:
Part 1:
Total number of comments divided by the expenses
Total number of likes divided by the expenses.
Part 2:
Yes. According to both definitions, website A has more user engagement per a single dollar expense.
Explanation:
User Engagment: Likes and comments
Website A:
500 comments/$20,000= .025
3500 likes/$20,000= .175
Website B:
450 comments/$47,000= .0095
3500 likes/$47,000= .07
Website A has more user engagement per a single dollar expense.