Use the following information to work the problems in this section.

Annual demand: $12,500$

Order cost: $$250$

Holding$/$carrying cost: $30\%$

$1-999$: $$6\mathrm{.}50$

$1,000-2,999$: $$6\mathrm{.}40$

$3,000$ and over: $$6\mathrm{.}30$