Answer:
$9,240 loss recognized
$43,000 basis
Explanation:
Tax basis of share purchase is the cost of share together with any tax related to this purchase.
Mr. Slake's loss recognized on the February 13 sale is $9,240 = total cost of 1,580 share purchased in the past - total amount collected from sales of these share = $49,240 - $40,000 = $9,240
His tax basis in purchase of 1,600 shares on Mar 2 is $43,000, the total cost he paid to acquire 1,600 shares