The task is to generate the correct answer for a given math problem.

Example Input: 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 ?
Example Output: $ 5040

Example Input: Problem: tim came second in math . when his mother asked him how much he had scored , he answered that he got the sum of the first 12 even numbers . his mother immediately worked out the answer . how much had he scored in math ?
Example Output: 156

Example Input: Problem: if the radius of a cylinder is made 3 times and height is doubled , what is the new volume of the cylinder divided by the old one ?
Example Output:
18 .