Mary buys 8 widgets for $40.00. She adds $1.00 in enhancements to each widget and sells them for $9.00 each. What is Mary's estimated gross profit margin?

$1:00 per widget enhancement = $48:00

$48:00/8

= $6:00

=========Sells for $9:00 each, so total gross profit is 8 * $3:00 ($9:00 - $6:00)

= $24:00 total gross profit on all widgets, $3:00 gross profit per widget.

gross profit margin= total profit / total sales

profit = 9 × 8 - ( 40 + 8 ) = 24

sells = 9 × 8 = 72

24/72 = 33%