Answer:
67.50
Explanation:
You want the cost of printing 950 business cards if the cost of printing x of them is C(x) = 0.05x +20.
Evaluation
To evaluate the cost function, put 950 where x is, and do the arithmetic.
C(950) = 0.05·950 +20
C(950) = 47.50 +20 = 67.50
The cost of printing 950 business cards is 67.50.