Suppose the demand function for cable TV service is given by QCTV = 15 - 0.25 × PCTV + 0.0005 × M + 0.3 × PSTV, where QCTV is the quantity of cable TV demanded (thousands of households), PCTV is the price of cable TV, M is income and PSTV is the price of satellite TV service. If consumers' income is $50,000 and the price of satellite TV service is $90, then which of the following gives the demand curve for cable TV?
A. QCTV = 17 - 0.25 × PCTV
B. QCTV = 67 - 0.25 × PCTV
C. QCTV = 15 - 0.25 × PCTV + 0.0005 × M + 0.3 × PSTV
D. QCTV = 13 - 0.25 × PCTV
B. QCTV = 67 - 0.25 × PCTV
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