4/25 = 8/50 = 12/75 = 16/100 = 20/125 = 24/150 = 28/175 = 32/200 = 36/225 = 40/250 = 44/275 = 48/300 = 52/325 = 56/350 = 60/375 = 64/400 = 68/425 = 72/450 = 76/475 = 80/500
Hope this helps. :)
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