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harga jual = (50-1/2x). x = 50x -1/2x²
untung P = h jual - biaya = 50x -1/2x² - (1/4x²+35x+25) = -6/8x²+15x-25
P maks jika P' = 0
P' = -6/4 x + 15 = 0 maka x = 10 jawaban A