2) A department store sells a certain handkerchief for PhP40 per piece. The store averages sales of 80 pieces each week. The store manager's past experience leads him to believe that for each PhP2 increase in the rice of the handkerchief, one less piece would be sold each week. What price would result in PhP3, 648 weekly sales?
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Answer:
so that if it sell on php48 or php152 it would result in php 3,648 weekly sales