If my calculations are in order and correct, that puts the unit cost below $10,000 I believe....
i.e
$40,000 x (0.8) = 32000
32,000 x (0.7) =$22400
22,400 x (0.55) =$12,320
12320 x (0.8) = $9,856
This of course assuming that the reductions were compounded in that order...