Suppose the demand curve for a product is given by Q=121P+2PS where P is the price of the product and PS is the price of a substitute good. The price…

Suppose the demand curve for a product is given byÿQ=12?1P+2PSÿwhere P is the price of the product and PSÿis the price of a substitute good. The price of the substitute good is $2.70.ÿSuppose P=$0.60. The price elasticity of demand is ?0.035. Theÿcross-price elasticity of demand is?