Okay, here we have this;
Considering the provided information and values, we are going to calculate the requested amount, so we obtain the following:
Then we will solve using the following formula:
Monthly salary withholding = Monthly salary * Percentage of salary withholding
Replacing:
Monthly salary withholding = 8500 * 34.2%
Monthly salary withholding = 2907
Finally we obtain that each month will be withheld $2907 for taxes and social security.