Given a math problem with context and a question and 5 answer choices, the task is to provide the correct answer choice based on the problem. You must choose one of the given answer choices by letter: a, b, c, d, or e; anything else is invalid.
Q: Problem: if the personal income tax rate is lowered from 46 % to 32 %, what is the differential savings for a tax payer having an annual income before tax to the tune of $ 36000 ?
Options: a. $ 3500, b. $ 5040, c. $ 3150, d. $ 7000, e. $ 10000
A:
b