Answer:
Choice D.
Explanation:
We ar told that if x > 200, then we would use the bottom equation to calculate the bill amount. Now, in our case 300 > 200; therefore, we use
[tex]0.10(x-200)+30[/tex]
Putting in x = 300 gives
[tex]\begin{gathered} 0.10(300-200)+30=10+30 \\ =40 \end{gathered}[/tex]
Hence, the correct choice is Choice D.
