How do I get a refund after purchasing an app from the Mac App store?

I bought an app and it is so bad despite its low price that I am willing to spend time on getting a refund. How do I get the refunded after an app purchased through the Mac App Store?

Do the following steps

• open up Your Account in iTunes by clicking Account inside iTunes Store
• click see all in the Check Your Purchase History row
• click the Report a Problem button
• select the App from which you want to refund
• explain and write a detailed reason why you think you should get a refund for the app

The Mac App Store does not have automatic refund policy. First you have to contact the developer in case of any app issue. But if have bought it mistakenly, then you will not get refund.

For official MAS FAQ : http://support.apple.com/kb/HT4461