Answer :
If you will sell the 20 stocks you will gain $75 or $3.75 per stock. This is computed as follows:
35 1/4 - 31 1/2; 35.25 - 31.5 = 3.75
=3.75 x 20
=$75
35 1/4 - 31 1/2; 35.25 - 31.5 = 3.75
=3.75 x 20
=$75