Find the part using the percent equation.

What is 0.8% of $6400?

To find the part, we can use the percent equation:

Part = Percent x Whole

In this case, the percent is 0.8% (which can be written as 0.008 in decimal form) and the whole is $6400. Plugging these values into the equation:

Part = 0.008 x $6400

Calculating this equation gives:

Part = $51.2

Therefore, 0.8% of $6400 is $51.2.