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Verified answer
40%=8.00020%=5.600
20.000+8.000-5.600=22.400
Naik 40%
40/100 x 20.000 = 8000
Rp 20.000 + Rp 8.000 = Rp 28.000
Turun 20%
20/100 x 28.000 = 5600
Rp 28.000 - Rp 5.600 = Rp 22.400
Jawabannya Rp 22.400
maaf kalo salah