1. The problem statement, all variables and given/known data
Hi all! Having a problem with the ending of this question and I was wondering what I needed to do from here...

The coefficient of rigidity, n, of a wire of length L and uniform diameter d is given by

n=AL/d^4

If A is a constant and the parameters L and d are known to within ± 2% of their correct values, estimate the maximum possible percentage error in the calculated value of n.

Here is what I have so far...

dn = dn/dL x dL + dn/dd x dd

dn = d/d^4 dL + L/d^4 dd

n = d/d^4 x ΔL + L/d^4 x Δd

n = ΔL/L + Δd/d

Where do I go from here? Any help will be greatly appreciated