Assume we are working with a PWM signal with a 20 milliseconds period. Draw the PWM signal in a timing diagram (x-axis is time) with a duty cycle of 3% and another with 12% duty cycle. Clearly mark the time instance when the PWM signal changes. In each case, how long is the on duration (time during which the signal is high), and the off duration (time during which the signal is low) in microseconds? Show your calculations.