How to calculate the $\nabla \cdot \epsilon\nabla V = \nabla \epsilon \cdot \nabla V+\epsilon \nabla \cdot \nabla V $

Question

How to calculate the $\nabla \cdot \epsilon\nabla V = \nabla \epsilon \cdot \nabla V+\epsilon \nabla \cdot \nabla V $

I know the calculation of inner product and $\nabla$ ,but when if i have to calculate the in the same equation,i don't know how to calculate it,can anyone teach me or give me some hints?