You add the numbers of all 4 sides.
we have

The solution is the shaded area above the dotted line
we know that
If a point is a solution of the inequality, then the coordinates of the point must satisfy the inequality
We will verify all cases to determine the solution of the problem
<u>Case A)</u> Point 

Substitute the value of x and y in the inequality and verify

-------> is not true
therefore
the point
is not a solution of the inequality
<u>Case B)</u> Point 

Substitute the value of x and y in the inequality and verify

-------> is true
therefore
the point
is a solution of the inequality
<u>Case C)</u> Point 

Substitute the value of x and y in the inequality and verify

-------> is not true
therefore
the point
is not a solution of the inequality
<u>Case D)</u> Point 

Substitute the value of x and y in the inequality and verify

-------> is not true
therefore
the point
is not a solution of the inequality
therefore
<u>the answer is the Point B</u>

To better understand the problem see the attached figure
Cairo's cost is modeled by 45 + 24h
Tarantino's is modeled by 30h
For h = 6:
Cairo = 45 + 24*6 = 189
Tarantino = 180
For h = 7
Cairo = 45 + 24*7 = 213
Tarantino = 210
For h = 10
Cairo = 45 + 24*10 = 285
Tarantino = 300