For a CMOS inverter fabricated in a 0.18-μm process with VDD = 1.8 V, Vtn = -Vtp = 0.5 V, k1 N = 4k1p = 300 μA/V2, and having (W/L)n = 1.5 and (W/L)p = 3, find tPHL, tPLH , and tP when the equivalent load capacitance C = 10 fF. Use the method of average currents.