Determine the net effect on Tamara's adjusted gross income with regard to these capital asset transactions that occurred this year.
a. Sold ABCCo stock, acquired 2 years ago, for a $1,500 loss.
b. Sold collectible coins, held for 17 months, for a $2,000 gain.
c. Sold XYZCo shares, acquired 6 months ago, for a $4,100 loss.
d. Sold LMNCo stock, acquired 3 years ago, for a $500 gain.