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5/12 × 540 = 225 kursi
kursi kelas 2
40/100 × 540 = 216 kursi
kursi kelas 3
540 - (225 + 216)
= 540 - 441
= 99 kursi
5/12 = 0,41 = 41,6 %
Kelas ll :
40%
Maka kelas tiga :
100 % -(41,6% + 40%)
100% - 81,6 &
= 18,4%
Maka banyak kursi untuk kelas lll
18,4/100 × 540
= 99 buah