Answer:
The Pareto Optimal height is

Explanation:
The Pareto Optimal height is a height of the seawall at which an increase in wall height will exceed the amount the resident are willing to pay and a decrease will affect the protection of the city
The number of residents is

The amount each are willing to pay is
$10 per inch
The cost of building a wall that is i inches high is given by

The total amount the residents are willing to pay is
= $1000
The maximum cost is mathematically represented as

which implies that
1000 = 10i
Hence the Pareto Optimal height is
=>

