Jawabanmu

2014-05-30T16:33:41+07:00
Jawaban paling cerdas!
2014-05-30T16:42:07+07:00
Keliling gelang = 3,14 x 50 = 157 cm besi yg dibutuhkan = 157 x 40 = 6280 cm = 62,8 m biaya beli besi = 62,8 x 1000 = 62800 biaya pengelasan = 250 x 40 = 10000 total biaya = 62800 + 10000 = 72800 jadi total biayanya Rp. 72800
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