Karen makes the following purchases and sales of stock:

Transaction

Date

Number of Shares

Company

Price per
Share

Purchase

1 1 2010

300

MDG

$ 75

Purchase

6 1 2010

150

GRU

300

Purchase

11 1 2010

60

MDG

70

Sale

12 3 2010

200

MDG

80

Purchase

3 1 2011

120

GRU

375

Sale

8 1 2011

90

GRU

330

Sale

1 1 2012

150

MDG

90

Sale

2 1 2012

75

GRU

500

Assuming that Karen is unable to identify the particular lots that are sold with the original purchase, what is the recognized gain or loss on each type of stock as of the following dates:

a. 7 1 2010.

b. 12 31 2010.

c. 12 31 2011.

d. 7 1 2012.