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Verified answer
Turunanp(x) = x² - 36x + 420
pendapatan maksimum , jika p '(x) = 0
2x - 36= 0
x = 18
pendapatan dari hasil penjualan
p(18) = 18² - 36(18) + 420 = 96
pendapatan = 96 satuan uang