The amplitude of upper and lower side bands of A.M. wave where a carrier signal with frequency 11.21 MHz, peak voltage 15 V is amplitude modulated by…

The amplitude of upper and lower side bands of A.M. wave where a carrier signal with frequency $\displaystyle 11.21$ MHz , peak voltage $\displaystyle 15$ V is amplitude modulated by a $\displaystyle 7.7$ kHz sine wave of $\displaystyle 5$ V amplitude are $\displaystyle \frac{\mathrm{a}}{10} \mathrm{~V}$ and $\displaystyle \frac{\mathrm{b}}{10} \mathrm{~V}$ respectively. Then the value of $\displaystyle \frac{\mathrm{a}}{\mathrm{b}}$ is \_\_\_\_.