5 % = 0,05 - десятичная дробь
5% = 5/100 = 1/20 - обыкновенная дробь
10% = 0,1
10% = 10/100 = 1/10
20% = 0,2
20% = 20/100 = 2/10 = 1/5
25% = 0,25
25% = 25/100 = 1/4
40% = 0,4
40% = 40/100 = 4/10 = 2/5
50% = 0,5
50% = 50/100 = 5/10 = 1/2
60% = 0,6
60% = 60/100 = 6/10 = 3/5
75% = 0,75
75% = 75/100 = 3/4
80% = 0,8
80% = 80/100= 8/10 = 4/5