A. A customer visits the supermarket and purchases 2 bags of detergent and 4 bar soaps and pays $50,000. The following month the customer returns and buys 4 bags of detergent and 6 bar soaps and pays $90,000. How much did each bag of detergent and each bar of soap cost you?

B. A company pays its sales agents based on a percentage of the first $100,000 in sales, plus another percentage on any amount over $100,000. If one agent received $8,500 for sales of $175,000 and another received $14,800 for sales of $280,000, find the two percentages.