What will be the major product in the following mononitration reaction?

Addition of ${\mathrm{NO}}_2$ is an electrophilic addition. The $\mathrm{N}$ increases the electron density on the left benzene ring, whereas the carbonyl group decreases the charge density of the right benzene group. As a result, ${\mathrm{NO}}_2$ is added to the left benzene group due to higher charge density.