PLS PO
your classmates want to earn extra income this quarantine time. To do this, you will sell online a disposable facemask. The wholesaler has the following conditions: if you purchase 100 boxes of disposable facemask, each costs P120; if you purchase between 100 and 300 boxes, the price per box is lowered to P110; if you get more than 300 boxes, the price per box is lowered by P15.​
Construct a mathematical model