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s15 = 15/2 (2.16 + 14.4)
s15 = 15/2 (32 + 56)
s15 = 15/2 . 88
s15 = 15 . 44 = 440 + 220 = 660
maaf kalo salah
= 7,5 ( 32 + 56 )
= 7,5 × 88
= 660 kursi