Respuesta :

Step-by-step explanation:

P= R - C = -0,5x^2 + 70x -2100= 300

P=-0,5x^2 +70x -2400=-0,5(x^2 -140x +4800)=-0,5(x^2- 80x -60x +4800)=-0,5(x-60)(x-80)=0

so x =60 or x=80

patelpriyanka6012

Answer:

Total cost is 123 items selled

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