A regression analysis between sales (in $1000) and advertising (in $100) resulted in the following least squares line: yhat = 75 + 6x. This implies that if advertising is $800 (i.e. x=8), then the predicted amount of sales (in dollars) is: Hint: Multiply from the equation by $1000.
$4,875
$123,000
$487,500
$12,300