20% = 84.000 - harga beli/x x 100%
20x = (84.000 - x) 100
20x = 8.400.000 - 100x
100x + 20x = 8.400.000
120x = 8.400.000
x = 8.400.000/120
x = 70.000
Jadi, Gibran membeli barang seharga Rp. 70.000
", "url" : "https://www.utakatikotak.com/tag/Ibra", "publisher" : { "@type" : "Organization", "name" : "utakatikotak.com" } }