Answer:
Marginal revenue -$75.40
Step-by-step explanation:
Marginal revenue is change in revenue due to 1 unit change therefore we need to calculate total change in revenue
we know that
total revenue

for 300 unit total revenue is

And for 301 unit total revenue is

Now
Marginal revenue = net total revenue = (13424.6 - 13500) = -$75.40