A sawtooth waveform is fed to "Average reading (with full scale rectification)" ac electronic voltmeter. This voltmeter is calibrated for RMS value of pure sinusoidal input. What will be reading displayed on voltmeter? Also find percentage error in the reading. Take amplitude as 10 volts and time period of 1 second."

Please help me. I am not able to solve it since 1 hour. No idea what to do. Answers are:

1. RMS indication - 6.5 V
2. error - 12.7%