CRM Percent custom fields: When will it show the % symbol and behave like %?

CRM Percent custom fields: When will it show the % symbol and behave like %?

1. Actually Percent custom fields fail to show the % symbol.
2. When in formulas Percent fields work like number:

100 x 5% = 5         ideal world
100 x 5% = 500     what happens actually

3. When importing Percent fields the % symbol has to be removed and the data type available to choose are "Text" or "Number". If imported with the % symbol the field remains blank.