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30.000 = Harga pertama didiskon 50 % - harga pertama diskon 50 % ,
trus didiskon lagi 20 %
maka :
30.000 = 1/2x - 1/2x . 1/5
30.000 = 1/2x - 1/10x
30.000 = 4/10 x
x = 30.000 x 10/4
x = 75.000
x = adalah harga pertama dari baju
30000 = H x 50% - ( H x 50% x 20% )
30000 = 0,5H - 0,1H
30000 = 0,4H
H = 30000/ 0.4
H = 75000
jadi harga sebelum diskon Rp.75000