:对新产品的需求数据 Table 12-1 The demand for widgets X4 (quantity)(price, $)(income per week, $)(earnings per week, $ 298 2975 45498 296 294.9 294 2935 292 292.8 290 2902 37 288 289.7 34 23456789 286 285.8 284 284.6 30 282 281.1 10 28 278.8 12-512-5 例：对新产品的需求数据 Table 12-1 The demand for widgets