By the chain rule,

so

It's kinda hard to tell which values are which in the table, but if I had to guess, you should get
225
Step-by-step explanation:
Look it up on google.
C = 16h
This is the basic set up of a cost function which is a direct correlation.
Y = a (b^x)
1) x = 0, y = 3500
=> 3500 = a (b^0)
=> 3500 = a (1)
=> a = 3500
2) growth percent = 3.5% => growth rate = 1.035 = b
=> y = 3500 (1.035)^ x
3) year 2020 => x = 2020 - 2000 = 20
4) y = 3500 (1.035)^ 20 = 6964
Answer: 6964.