Q. The subsequent cell-phone offer by Sprint is typical of Illustrate what one can get on a cell phone plan: 4,000 free minutes for $39.99 a month. The fine print says that only 350 of those minutes are anytime minutes; the remaining is restricted to evening also weekend usage. If you go over your allotted time, you are charged 35 cents every minute for any additional minutes. Illustrate what is marginal cost?
Q. If price increases from $45 to $55, the marketplace quantity supplied increases from 20 units every week to 30 units every weed. The price elasticity of supply is?