Jawabanmu

2014-09-11T15:15:03+07:00
Luas permukaan bola pingpong = 4 x π x r² = 4 x 3.14 x 2 x 2 = 50.24 cm²
Harga per bola ping pong = 18840000 / (50.24 x 250) = 1500 rupiah
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