# Math

A marketing expert determines that sales of television sets an be increased by 3 sets per week for each \$20 decrease in price. Weekly sales average 18 sets at \$440 each. What price should be given in order to receive \$10,800 in revenue?

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1. (18+3x)(440-20x)=10800
We get, -60x^2 + 960x - 2880 = 0;
Using Quadratic Equation, we have x= 12 or 4; Price = (440-20x); We have 440-80 or 440-240; We get \$360 or \$200 as the price.

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