Assuming that you need 0.056% of 1291, you can solve this in the following way.
A simplified version of the equation would be 1291-(1291*0.00056).
1 = 100% in decimal form. In the same way, 0.5 = 50%. Using that, you should be able to solve the problem if it is, infact, what the question was asking. More clarification would be preferable, however.