проценты:5%,10%,20%,25%,40%,50%,60%,75%,80%.
десятичная дробь:
обыкновенная дробь:​

5% = 5/100 = 1/20 = 0,05

10% = 10/100 = 1/10 = 0,1

20% = 20/100 = 1/5 = 0,2

25% = 25/100 = 1/4 = 0,25

40% = 40/100 = 2/5 = 0,4

50% = 50/100 = 1/2 = 0,5

60% = 60/100 = 3/5 = 0,6

75% = 75/100 = 3/4 = 0,75

80% = 80/100 = 4/5 = 0,8