Question

Tolong dijawab yaaaa

Answer 1

Verified answer

Un = a + (n - 1)b

Barang A : menurun => b = -20, a = 2100
Un = 2100 + (n - 1)(-20) = 2100 - 20n + 20 = 2120 - 20n

Barang B : meningkat => b = 30, a = 1000
Un = 1000 + (n - 1)30 = 1000 + 30n - 30 = 30n + 970

Jumlah barang B = jumlah barang A
30n + 970 = 2120 - 20n
30n + 20n = 2120 - 970
50n = 1150
n = 23

Answer 2

Jawabannya minggu ke 23 yaa pakai deret aritmatika