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keliling persegi 1 = 16cm, kell persegi 2 = 28.
perbandingannya 16:28 = 4:7
2. harga 1 pensil = 13.000/5 = 2600.
harga 2 lusin = 2×12 x 2600 = 24 × 2600 = 62.400
2) harga 2 lusin pensil 62.000