Based on the CPI in both places, the Brexington salary in Charlieville is $30,000.
This can be found by the formula:
= Brexington salary x CPI of Charlieville / CPI of Brexington
Solving gives
= 50,000 x (90 / 150)
= $30,000
In conclusion, option A is correct.
Find out more on CPI at https://brainly.com/question/512131.