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40% itu dari 100%-20%-15%-25% = 40%
karena anggrek 90 derajat = 1/4 bagian = 25 %
jumlah seluruh siswa =
100%÷40% ×60 = 150 orang
= 100% - 60% 40%
⇒ jmlh siswa SMP Harapan Jaya :