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u4=30.000
u8=172.000
r = u8-u4 / 8-4
= 172.000-30.000 / 4
= 35.500
r disini adalah pertambahan keuntungan per bulan
u18=a+17b
u18=a+7b+10b
=u8+10b
=172.000 + 10x35.500
=527.000
Jadi keuntuntungan sampai bulan ke 18 adalah 527.000