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"Secara konstan"Pakai barisan aritmatika
Barang A :
a = 2.100
b = - 20
Un = a + (n - 1)b
Un = 2.100 + (n - 1)-20
Un = 2.100 - 20n + 20
Un = 2.120 - 20n
Barang B
a = 1000
b = 30
Un = a + (n - 1)b
Un = 1000 + (n - 1)30
Un = 1000 + 30n - 30
Un = 970 + 30n
Memproduksi barang yg sama , maka :
2120 - 20n = 970 + 30n
2120 - 970 = 30n + 20n
50n = 1.150
n = 23
Pilihan B