How many items do i need to sell to make profit when i buy an item at 1.45 each and sell item for 2.00 each and spend 24.00 on an ad to sell them?

The gross profit to the seller on each sale equals the sale price minus the cost price; the problem states that this unit gross revenue is 2.00 - 1.45 = 0.55. Net profit equals gross profit minus cost; therefore the number sold (N) must satisfy the inequality
0.55N > 24.00, or N > 24.00/0.55 = 44, to the justified number of significant digits. Therefore, at least 44 items must be sold to generate a net profit.