This problem is about percentages.
The total earnings are $72,000.
We know that income tax is 16%, Social Security is 6.2% and Medicare tax is 1.45%. To find the total amount of money Petunia pays in taxes, we need to multiply her earnings with each percentage in decimals, remember that 16% is 0.16, 6.2% is 0.062 and 1.45% is 0.0145.
Income tax
Social Security
Medicare tax
So, the total amount of money paid would be the sum
Therefore, the right answer is A.