Let x = the number of cards printed and sold each month. Therefore, the cost is equal to 6000 + 0.18x, and revenue is equal to 0.30x. You’re looking for the point where revenue is greater than the cost (revenue > cost). The inequity is 0.30x > 6000 + 0.18x. Subtracting 0.18x from both sides of the inequity results in 0.12x > 6000. Divide both sides by 0.12. The result is that x > 50,000. The printing plant would have to print and sell more than 50,000 cards per month to make a profit. Therefore, the only correct answer is 60,000.