Researchers have found that during the last recession, when income fell by 6 percent, many fast-food restaurants saw their sales increase by 8 percent while the sales of soda fell by 12 percent in grocery stores. what is the income elasticity of these groups of goods?

Income elasticity is obtained by dividing the percentage change in the quantity demanded of a product with by the percentage change in income. 

When income fell by 6 per cent and sales of many fast food restaurants increase by 8 per cent, then the income elasticity for fast food would be:

8/-6 = -1.33 

When income fell by 6 percent and sales of soda decreased by 12 percent, then the income elasticity for soda would be

-12/-6=2 

the answer would be voluntary exchange -

"the act of buyers and sellers freely and willingly engaging in market transactions. moreover, transactions are made in such a way that both the buyer and the seller are better off after the exchange than before it occurred."

hope this : )

-shy

a recipe serves 8 people, and calls for 5 lbs of apples and 2 cups of flour. you want to prepare it for 24 people. divide 24 by 8 to get 3, and then multiply your ingredients by 3.

so for 24 people, you'll need 15 lbs of apples, and 6 cups of flour.