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 39.00x The predicted sales revenue for a month in which $1,000 was spent on advertising is O A $8 951 70 OBS851 70 C. $41,700 OD S90.000 OE $50.000