Partial Derivatives & the Gradient · Medium problem

A cylindrical can's volume $V = \pi r^{2}h$ must stay within $5\%$ of its nominal value. If the radius is held to a relative error of at most $1\%$, use differentials ($\dfrac{dV}{V} \approx 2\dfrac{dr}{r} + \dfrac{dh}{h}$) to find the largest allowable relative error in the height, as a percentage.