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524 Electricity: Calculate monthly charge for running a scroll saw

CMP is installing a new transformer to supply power to my woodworking shop. Its primary side has 200 turns (110 volts), and its secondary side had 500 turns. It supplies power to the following circuit: (refer to attachment). CMP charges me $0.015 per kWhr. My scroll saw (item R3) runs for 45 hours per month. What is my month

Calculate the approximate switching time that is obtained if the output is loaded by a capacitance of 0.2 pF due to interconnections and the inputs of other gates, in the given CMOS inverter circuit.

The circuit shown in Figure B2 (in the attachment) is of a CMOS inverter driving a capacitive load. VDD represents logic level "1" and zero volts logic level "0". M1 is an nMOS device and M2 is a pMOS device. Calculate the approximate switching time that is obtained if the output is loaded by a capacitance, CL, of 0.2 pF due