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S10: 10/2 (2.3.000.000+9(500.000)
S10: 5 (6.000.000+4.500.000)
S10 = 52.500.000
ket:
Sn: jumlah suku ke-n
n : suku ke- ...
a: suku pertama
b: beda
tahun ke 10=300.000 +(10x500.000)
=300.000 + 5000.000
=8.000.000