Answer:
22% , 0.3, and 19/50
Explanation:
to make the comparison we need to convert all of the quantities to one format. 
Converting to porcentages:
0.3 = 30/100 = 30 % 
19/50 = 38/100 = 38%
22% = 22% 
so from least to greatest:
22%
0.3 = 30% 
19/50 = 38%