if we take 4100 to be the 100%, what is 870 off of it in percentage?

Given the graph, you can assume that f(x) is the y of an equation.
When f(2) is given, this means that what is the y value when x=2?
As you can see, the solution is between 8 and 10. Meaning that the closest answer is 9.
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Answer:
your screen is blue i can't see the problem dummy