



Final answer: ⇒ 
Hope this helps!
And thank you for posting your question at here on brainly, and have a great day.
-Charlie
The answer is “the cost for every 1 lawn mowed”. This is because the graph is showing an increase in price every time another lawn is mowed.
There were 200 books sold. so, they need to sell 300 more to have 500 total books sold.