7. Cheryl's income elasticity for good A is -2.5. Her current income is $100,000 and she normally buys 100 units of good A per year. If her income increases to $110,000 how many units of good A will she buy?
  1. 250.
  2. 75.
  3. 125.
  4. 100.
  5. 82.5.


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