Correct Response: B. The first step in solving this problem is to determine the price for each perennial ($5) and then multiply the $5 by the total amount of perennial plants (12), which equals $60. To find the discount, find 10% of 60, (0.10)(60) = $6. Subtracting this from $60 gives the customer's total of $54. Response A comes from subtracting $12 from $60. Response C comes from finding a 10% discount on the first 10 plants, which is $5, and subtracting that from the $60 cost. Response D is the cost of 12 plants at $5 per plant with no discount.