6. Data were collected on monthly sales revenues (in 1,000s) and monthly advertising expenditures ($100s) for a sample of drug stores. The regression line relating revenues (y) to advertising expenditure (x) is estimated to be y=-48.3+9.00x. The predicted sales revenue for a month in which $1,000 was spent on advertising is

A. $851.70 B. $8,951.70 C. $90,000 D. $50,000 E. $41,700