Please help me I do not understand how to do these calculations???

Roberto Clemente is paid $50 per hour, plus time-and-half for hours over 40 for a given week. During the week of January 7, Roberto worked 46 hours. Social Security tax is 6.2%; Medicare tax is 1.45%; $294 is withheld for federal income tax; $110.25 is withheld for state income tax; $36.75 is withheld for city tax; $173 is withheld for medical insurance; and union dues are 2% of gross wages. In addition, Robertos employer must pay social security taxes of 6.2%; Medicare taxes are 1.45%; state unemployment taxes of 5.4%; federal unemployment taxes of 0.8%; and medical insurance of $403.

Calculate: (Must show all calculations) Round answers to nearest penny.

1. Robertos gross earnings.

2. Robertos take home pay.

3. The employers Payroll Taxes Expense.

4. The total cost of employing Roberto for the week.