Final answer:
To cover the initial investment of $400, the owner needs to sell 200 packs of pens at a profit of $2 per pack. The given statements regarding the owner's profit do not account for the initial investment and are incorrect when considered in isolation.
Step-by-step explanation:
To determine the owner's profit from selling the new line of pens, we need to calculate both the total revenue and total cost. The owner buys a pack of 10 pens for three dollars and sells each pack for five dollars. To calculate the profit per pack, we subtract the cost price from the selling price: $5 - $3 = $2 profit per pack.
Now, we need to find out how many packs the owner must sell to cover the initial investment of $400. Since the profit per pack is $2, dividing the initial investment by the profit per pack gives us the number of packs needed to break even: $400 / $2 = 200 packs.
Finally, we verify the statements provided to find out which one correctly depicts the owner's profit:
- The owner made a profit of $20.
- The owner made a profit of $30.
- The owner made a profit of $40.
- The owner made a profit of $50.
None of the given statements are correct when considering just the profit per pack; they ignore the initial investment.