A particular n-channel enhancement MOSFET is measured to have a drain current of 4 mA at VGS = VDS = 5 V, and 1 mA at VGS = VDS = 3 V. The value of \({k_n}\frac{W}{L}\) for this device is __________ (mA/V2).
Enter numerical value using the virtual keypad. Round off where necessary.