How many k ohm is the R?

QUESTION 6 When the switch in the RL circuit showed is closlad, the voltage Vi will decay exponentially according to the equation Rt If L = 0.072 H, E = 12 V, and at t1 = 2.7 us the voltage VI drops to 5.9 V, how many kQ is the R? V= Ee + L V E R