Invisible export means export of

Prof. Muhammad Yunus, the recipient of the Nobel Peace Prize 2006, is the exponent of which of the following concepts in the filed of banking?

Who is the author of the book Women of Vision ?

One of the famous Indian sportspersons released his/her autobiography 'Playing to Win' in November 2012. Name the sportsperson correctly.

Every year March 20 is celebrated as what day? 

The NRIs while investing in the equity of a company cannot buy more than a prescribed percentage of the paid-up capital of that company. What is the prescribed percentage?