Consider the following amplitude modulated signal

Q. Consider the following amplitude modulated signal:

𝑠(𝑡) = cos(2000 𝜋𝑡) + 4 cos(2400 𝜋𝑡) + cos(2800 𝜋𝑡).

The ratio (accurate to three decimal places) of the power of the message signal to the power of the carrier signal is

Ans: 0.125