34 . Selected information from the accounting records of the Blackwood Co . is as follows Net A / R at December 31 2000 8 900.000 Net AR at December 31 . 2001 $1 000.000 Accounts receivable turnover 5 to 1 Inventories at December 31 . 2000 $1 100.00 Inventories at December 31 2001 $1 200.000 Inventory turnover 4 to 1 What was the gross margin for 2001 ? a . $150.000 b . $200.000 $300.000 d . $400.000