Justin Thyme used to run one batch each of $500$ As$,300$ Bs and $100$ Cs every month but now he runs a batch of $5$ As$,3$ Bs$,$ and $1$ C every half day with the use of:

$1)$mixed$-$model assembly.

$2)$single$-$digit setups.

$3)$andon lights.

$4)$push method.