A bag was offered to sell at $6.90. The cost was 30% of the selling price. Answer the following questions, and choose the closest answer from the possible choices following each question:

a. If the bag was marked down at 20%, what would be the sale price of the bag?

b. What was the price needed to cover only the cost?

c. If the bag was marked down by $1.50, what would be the rate of markdown?