1 twentieth = 0.05. Thus four twentieth's = 0.2
5%
one twentieth = 0.05 into decimal or 5%
Per cent means "for every hundred" so if you have 1 for every 20 (one twentieth) then you have 5 for every 100...five one hundredths, or five percent.
5%
15%
One-twentieth
.0005
1/5
5%
0.0005
1/20 = 5/100 = 5%