There are plenty of ways to increase the number of likes on your facebook business pages. I am providing you with the very basic and mandatory list of to-dos while working on facebook business page:
1)Quality updates and Consistent Engagement is the must.
2)Reward your loyal customers and encourage them to support you over facebook
3)Take Leverage of Your Existing Social Networks
4)Integrate Facebook Social Plugins to Your Website So that more visitors can know about your page and can like it
5)Promote your facebook page over forums and other social networks like linkedin, focus etc.
6)Take the initiative and help others in your network
Hope you would find these tips useful.