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setiap 4 meter akan dipasangi lampu, lampu yang akan dipasang =
280 : 4 =70 lampu
harga sebuah lampu = 30.000
harga 70 lampu = 70 x 30.000= 2.100.000
kemudian di bagi 280 / 4 = 70
70 x 30.000=2.100.000,