When the local used bookstore prices economics books at $15.00 each, they sell 70 books per month. If they lower the price to $7.00 each they sell 90 books. If so, the price elasticity of demand for the books is

0.34,

Explanation:

% change in qty = { (90-70) / [(90+70)/2} *100 = 25%

% chnage in price =  { (7-15) / [(7+15)/2} *100 = -72.73%

PRICE ELA OF DEMAND = CHANGE IN QTY/  CHANGE IN PRICE

PRICE ELA OF DEMAND =  25/72.73 = 0.343

an increase in price from $7.00 to $15.00 results in an increase in total revenue.

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