Answer:
The revenue function is
The marginal revenue function is

Explanation:
We have
where
is the number of cakes sold per day and
is the price.
Also, we have
where
is also the number of cakes and
is the total cost.
The revenue would be

The marginal revenue would be the derivative of the revenue function
![(d)/(dx)[580x-10x^(2) ] =580-20x](https://img.qammunity.org/2021/formulas/mathematics/college/bzjt4791b7i8xypchxu4r4fngg3503ccbk.png)
Therefore, the answers are
and
, respectively.