【单选题】Last year, Jack's income was $15,000 and he bought 50 bags of potato chips. This year his income is $18,000 and he buys 55 bags of potato chips. Therefore, Jack's (去年,杰克的收入是15000美元,他买了50袋薯片。今年他的收入是18...
A.
income elasticity of demand for potato chips is 0.52.薯片需求收入弹性为0.52。
B.
price elasticity of demand for potato chips is 0.52.薯片需求价格弹性为0.52。
C.
income elasticity of demand for potato chips is 1.66.薯片需求收入弹性为1.66。
D.
price elasticity of demand for potato chips is 1.66.薯片需求价格弹性为1.66。