Before the advent of unlimited music streaming plans, online music retailers generated most of their revenues through sales of individual songs. Suppose that, when buying individual songs each month, Carter has an inverse demand curve of P= 6 -0.2Q (or Q = 30-5P), where Q is the quantity of songs and P is the price per song. Given Carter's demand curve, what's the most Carter would be willing to pay for a monthly subscription service for unlimited music? That is, where the monthly subscription service is a fixed fee and then all individual songs are free. O $15 $30 $90 $180 None of the above answers are correct.