Mr. Daly, a chemistry teacher needs 10 liters of a 20% saline solution for his afternoon class. Unfortunately, the only mixture he has is a 5% saline and a25% saline solution. How much of each solution should he mix to produce the 20% solution?

Rose and andrew are financing $128,000 to purchase a condominium. they obtained a 15-year, fixed-rate loan with a rate of 5.05%. they have been given the option of purchasing up to four points to lower their rate to 4.81%. how much will the four points cost them?