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P : R
I 20 × 10 = 200 : 80 × 10 = 800
II 25 × 8 = 200 : 75 × 8 = 600
III 40 × 5 = 200 : 60 × 5 = 300
maka perbandingan R
I : II : III
800 : 600 : 300
8 : 6 : 3