2 per 5 + 20 persen + 0,25=

2/5 + 20/100 = 40/100 + 20/100 = 60/100 ÷ 10 = 6/10

6/10 + 25/100 = 60/100 + 25/100 = 85/100 ÷ 5 = 17/20

2/5 + 20% + 0,25
2/5 + 20/100 + 25/100     (disamakana penyebut )
(2/5 x 20/20) + 20/100 + 25/100
40/100 + 20/100 + 25/100
85/100 (disederhanakan, masing-masing dibagi 5)
17/20 
atau bila didesimalkan = 17/20 = 0,85
bila dipersebkan = 0,85 = 85/100 x = 85%