Answer: David made $675 from 30 shares.
Explanation:
Since we have given that
Number of shares = 30
Cost price of shares of Amazon = $121.00
So, total cost price of shares of Amazon is given by
Number of shares × Cost price of each share
Selling price of each share = $ 143.50
So, total selling price of shares of Amazon is given by
Number of shares × Selling price of each share

So, Amount David made is given by
Selling Amount - Paid Amount

Hence, David made $675 from 30 shares.