12. 40 pieces of certain goods are sold every day in the shop.
Profit per one piece of this product is 240 USD.
a) Expert A claims that lowering the price by x USD will increase
daily sales of this product by x pieces. How much should I lower
the price to make the profit? How much will the profit increase
then?
b) Expert B claims that increasing the price by USD (20 * x) will
decrease the daily sale of this commodity by x pieces. How much
should the price be increased for the profit to be the highest? How
much will the profit increase then?
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