Bingo's Copy Center needs to buy white paper and yellow paper. Bingo's can buy from three suppliers. Harvard Paper sells a package of 20 reams of white and 10 reams of yellow for $60, Yale Paper sells a package of 10 reams of white and 10 reams of yellow for $40, and Dartmouth Paper sells a package of 10 reams of white and 20 reams of yellow for $50. If Bingo's needs 340 reams of white and 410 reams of yellow, how many packages should it buy from each supplier to minimize the cost?
Find the amount of packages each of the given company's: Harvard, Yale and Dartmouth should order. Then find out the least possible cost?