Step-by-step explanation:
we bought 500 shares per $39.
so, we had to pay
500×39 = $19500
yesterday we sold 200 of the 500 shares per $45.
since the price was higher than the original buying price, we gained.
we gained 200 shares times the difference in shares price.
200×(45-39) = 200×6 = $1200
we gained $1200 in total.
we gained 45-39 = $6 per share.
we have 500-200 = 300 shares left.
the current market value of these shares is
300×45 = $13500