2. The monthly quantity demanded of Walter Serkin's record with Beethoven's Moonlight Sonata, produced by Phonola, is related to the price per record. The equation: ... relates the demand to the unit price in dollars and x is the number of discs demanded. The total monthly cost for printing and packaging x copies of this classic disk is given by ... dollars. How many copies per month should Phonola produce to maximize its earnings?

2. La cantidad mensual demandada del disco de Walter Serkin con la Sonata Claro de Luna de Beethoven, producida por Phonola, se relaciona con el precio por disco. La ecuacion: p =-0.00042x +6 (0