Einstein's Special Theory of Relativity Quesion

I have no idea how to start this problem, We barely learned alittle part of this in class today but the teacher just said read the book and it is easy to undertand. :rolleyes: I read the book over and over but I don't know.... :confused:

Quote:

Einstein's Special Theory of Relativity says that mass m is related to v velocity by the formula

http://img.photobucket.com/albums/v6...337058img3.gif
Here, m0 is the rest mass and c is the velocity of light. Use differentials to determine the percent increase in mass of an object

when its velocity increases from 0.8c to 0.82c.

Approximate percent increase:_______