Answer
See the explanation as given below.
Work Step by Step
Let $x$ be the manufacturing cost.The fixed cost of a phone is $200,000$. During each bicycle it costs $250$.
Selling price per phone = 300
Thus, the revenue function R(x) will be $R(x)=300x$
and
Cost function $C(x)=200,000+250x$
Here, $200,000$ refers to the first cost overhead cost of the company and $250x$ will be the second cost will be used to manufacture each new phone.
