Store "XYZ Electronics" sells 2 types of screens, Plasma and LCD, and a DVD player. It faces the following demand schedule for different prices of Plasma. What is the cross-price elasticity of demand between Plasmas and LCDs as the price of Plasmas increases from $200 to $250? (Note: answer in decimal form. Include minus sign if answer is negative)

Price of Plasma=$200 Price of Plasma=$250 Plasmas Demanded 50 30 LCDs Demanded 100 150 DVD Players Demanded 200 180