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An audio signal $v_m = 20 \sin 2\pi(1500t)$ amplitude modulates a carrier $v_c = 80 \sin 2\pi(100,000t)$. The value of percent modulation is
$A_m = 20$, $A_c = 80$. Percentage modulation index $= \frac{A_m}{A_c} \times 100 = \frac{20}{80} \times 100 = 25$.
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