One month ago, Olivia purchased 300 pages of printer paper at $1 per sheet. Today she learned that the price of the printer paper had risen to $1.50 per sheet, so she purchased only 100 sheets. 1.m -""-9------------ I I I I I I I 100 300 Using the graph of printer paper elasticity below and the midpoint formula, the own-price elasticity is a.) -1 o b.) 1.25 o c.) 0.5 I d.) -2.5