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.