A single-phase inverter is fed from a $100\: V$ dc source and is controlled using a quasi-square wave modulation scheme to produce an output waveform, $v(t)$, as shown. The angle $\sigma$ is adjusted to entirely eliminate the $3^{rd}$ harmonic component from the output voltage. Under this condition, for $v(t)$, the magnitude of the $5^{th}$ harmonic component as a percentage of the magnitude of the fundamental component is _____ (rounded off to $2$ decimal places).

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