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= 2 x22/7 x 3,5 x3,5
=77m persegi
biaya = 30.000 x77 = 2.310.000
separo bola = 1/2 ( 4 x 22/7 x 7/2 x 7/2) = 77
harga kain = 77 x 30 000 = 2 310 000 Jawaban A