I need help regarding the process of using the Nernst Equation.

Problem: The ion concentrations in two extracellular fluid spaces of the mammalian cochlea, the endolymphatic and perilymphatic spaces, are shown below. There is an endolymphatic potential of +90mV between these two spaces, endolymph positive w.r.t. perilymph (which is at the normal 0mV extracellular reference potential). The equilibrium potentials are given in the table below, calculated using the Nernst equation. Problem: Which is the directions of active transport (these are the opposite of the passive fluxes) of: a. Na+ b. K+ c. Ca++ d. Cl