Answer and Explanation:
The computation is shown below:
a. The rate of return in percentage is
= return ÷ investment
= $15 ÷ $150
= 10%
b. The economic profit is
= rate of return - normal profit rate
= 10% - 5%
= 5%
c. As the economic profit is more than 0 so it should be the entry
d. The rate of return in the long-run equilibrium to the 5% as the rate of return should be equivalent to the normal rate of profit