31. Bonita Industries has gathered the following information concerning one model of shoe:

Variable manufacturing costs	$40000
Variable selling and administrative costs	$20000
Fixed manufacturing costs	$160000
Fixed selling and administrative costs	$120000
Investment	$1500000
ROI	30%
Planned production and sales	4000 pairs

What is the total cost per pair of shoes?

a) $85

b) $50

c) $120

d) $185