When the price of salad was $5, a cafeteria sold 50 packets of salad dressing a day at $0.50 per packet. When they increased the price of salad by 40%, but kept the dressing at the same price, they sold 50% fewer packets of salad dressing. The cross-price elasticity calculated using the cross-price elasticity formula is and the goods are -1.25; complements 0.5; substitutes 1.25; substitutes O -0.5; complements