这是book6上面exam1 的第26题，对regression那部分内容不熟悉，那个inflation的作用是什么，它要考的是哪方面知识？请胡老师指教，谢谢！

An analyst estimated the following regression between the change in real industrial production and industry sales: in industry sales_t=8950+percentage change in real industrial production_t. Inflation is expected to be 3%. If industrial production was $1.2 trillion last year and is expected to be $1.25 trillion next year, the forecast for industry sales in closest to:

A $9397    B $9610   C $10396   D $10596