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Keliling taman = 2 × ( 50 + 20 )
= 2 × 70
= 140
lampu yang diperlukan = 140 : 10
= 14 lampu
b.
biaya keseluruhan = Rp 250.000 × 14
= Rp 3.500.000
2(50+20) = 140
a. 140 : 10 + 1 = 14 +1
= 15 lampu
b. 15 x 250.000 = Rp. 3.750.000