The price of printers decreases by 10%, and the quantity demanded of printer ink increases by 20%. Calculate the cross-price elasticity and determine the relationship between printers and printer ink.

• A. -2, indicating they are complements.
• B. -0.5, indicating they are complements.
• C. 2, indicating they are substitutes.
• D. 0.5, indicating they are substitutes.

Answer: (A)