A regression analysis between sales (in $1000) and advertising (in $100) resulted in the following least squares line: = 75 + 6x. This implies that if advertising is $8000, then the predicted amount of sales (in dollars) is: [ The meaning of the $ amounts in parentheses is that if advertising is entered in the equation in hundreds of dollars, the equation gives the sales in thousands of dollars]

a.$123,000.

b.$555,000.

c.$487,500.

d.$12,300.

e.$4875.