def total$\_$payroll$($self$)->$ float:

$"""$Return the total of all payments ever made to all employees.

$>>>$ my$\_$corp $=$ Company$([\backslash$

SalariedEmployee$(24,$ 'Gilbert the cat', $1200\mathrm{.}0),\backslash$

HourlyEmployee$(25,$ 'Chairman Meow', $500\mathrm{.}25,1\mathrm{.}0)])$

$>>>$ my$\_$corp.pay$\_$all$($date$(2022,6,28))$

An employee was paid $100\mathrm{.}0$ on $2022-06-28.$

An employee was paid $500\mathrm{.}25$ on $2022-06-28.$

$>>>$ my$\_$corp.total$\_$payroll$()$

$600\mathrm{.}25$

$"""$

# TODO: implement this method!