Please help me with all 3 parts! :

Sam's employer deducts 20% in payroll and state taxes from his base salary before writing his paycheck. Sam's monthly pay check is 1,600.
Part A: what is Sam's salary before the deductions for payroll and state taxes?
Part B: Sam puts 1/5 of his pay check into a saving account each month. How much does he save each month?
Part C: Next month Sam's employer is Changing it's pay scale, and Sam's base salary will change by -8%. His employer with still deduct 20% for taxes. What will be his salary before deduction and how much will his paycheck be next month?
Show your work.