25 menit = 100%20 menit = A( cara perbandingan) A = 20 x 100 / 25 = 80%A= 80%Selisih = 100% - 80% = 20%Jadi, penurunan sebesar 20%
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25 menit = 100%
20 menit = A
( cara perbandingan)
A = 20 x 100 / 25 = 80%
A= 80%
Selisih = 100% - 80% = 20%
Jadi, penurunan sebesar 20%