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1b. harga x 20%=Rp. 64.000,-
harga= Rp. 64.000,- x 100/2=Rp. 64.000,' x 5
harga=Rp. 320.000,-
1c. Rp. 60.000,- (100-x)%= Rp. 52.500,-
(100-x)%=0,875=875/1000=87,5 %
(100-x)%=87,5%
x%=100%-87,5%=12,5 %