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Verified answer
Harga setelah didiskon = 390.000500.000 - (%D x 500.000) = 390.000
500.000 - 500.000 %D = 390.000
500.000 %D = 500.000 - 390.000
500.000 %D = 110.000
%D = 110.000 : 500.000
%D = 0,22
D = 0,22 x 100%
D = 22%