The correct interpretation of the slope is that for each additional Data were collected on monthly sales revenues (in $1,000s) and monthly advertising expenditures ($100s) for a sample of drug stores....

The correct interpretation of the slope is that for each additional 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

ŷ = − 48.3 + 9.00x.
The predicted sales revenue for a month in which $1000 was spent on advertising is?