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1 kuintal = 100 kg = 1000 ons
1 pon = 5 ons
sisa pupuk paman = 1/2 ton + 1 kuintal - 80 pon
= (1/2 x 10.000) +(1 x 1000) - (80 x 5)
= 5000 + 1000 - 400
= 5600 ons (C)
17. keliling = 2πr
= 2 x 3,14 x 75
= 471,0 cm (C)
18. keliling = keliling 1/2 lingkaran + 20 + 20 + 14
= 1/2 πd + 54
= 1/2 x 22/7 x 14 + 54
= 22+54
= 76 cm (D)