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besar tabungan 800000 + 36000 = Rp. 836.000
8) U8 = 3(8)+7 = 31 U9 = 3(9)+7 = 34 selisih 34-31 = 3
9) gtw
10) a = 15 b =4 S20 =/
SN= n/2(2a+(n-1)b)
S20 =20/2(2*15+(20-1)4) = 1060 buah kursi
19 dan 20 gtw