Final answer:
The proper order is 2/7, 4/2, 12.5%.
Step-by-step explanation:
The proper order from least to greatest for 12.5%, 2/7, and 4/2 is 2/7, 4/2, 12.5%.
To compare the three values, we can convert the fractions into decimals. 2/7 is approximately 0.2857, 4/2 is equal to 2, and 12.5% is equal to 0.125. So, the proper order is 2/7, 4/2, 12.5%.
Learn more about Proper order of decimals and fractions