12. T, F. Modifies wage plan combines hour-rate and piece-rate plans. 13. T. F. Payroll functions include ensuring accuracy of employees credentials, computing employees wages or salaries, ensuring that all withholdings are accurately determined and ensuring that employees personal checks are available to them. 14. T, F. GRAVE-YARD Shift premiums for shop-floor workers will be debited to factory overhead cost as indirect cost. 15. T, F. Factory workers bonuses are usually charged to Direct Labor as part of their pay