Compute the energies of the photon:

Energy and frequency are related as E = hν

The frequencies of the FM radio stations range from about 90 to 108 MHz; let us take the frequencies of two FM stations as ν₁ and ν ₂ MHz, respectively

The energies of the photons corresponding to the radio frequencies of the two stations would be hν₁ and hν₂ respectively and can be calculated through substituting the values of h and the frequency.

The ratios of the energies could be calculated as

E ₂/ E₁ = hν₂/ hν₁   = ν₂/ν₁

You might substitute the values corresponding to the FM radio frequencies of your region and compute the ratio.