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maka :
9 buah taplak
= 9/20 x 86.000
= 9 x 4300
= 38.700 rupiah
jika 20 taplak = 86.000
maka 9 taplak = x 86.000 = Rp. 38.700
p/s:cara yang digunakan ialah perkalian silang