Concept:A discount of 10% means the buyer pays only 90% of the original cost.Explanation:Original cost =GH₵ 600.00Discount rate =10%Percentage to be paid =100%−10%=90%Selling price =90% of 600=10090×600=90×6=GH₵ 540.00Answer:Selling price =GH₵ 540.00Correct option: D. GH₵ 540.00