Answer:
$18
Step-by-step explanation:
Since the manufacturer sold twice as many units of Q than P, that means it at least sold 1 unit of P and 2 units of Q.
to determine the arithmetic mean (average) revenue per unit:
total revenue = P + 2Q = $20 + (2 x $17) = $20 + $34 = $54
arithmetic mean (average price) = $54 / 3 = $18