Two coherent light waves of the same frequency travel to a detector. At the detector, wave 1 has an amplitude of $A_0$ and an intensity of $I_0$. Wave 2 has an amplitude of $0.3A_0$. The path difference between the waves at the detector is $1.5\lambda$, where $\lambda$ is the wavelength of the waves.

What is the resultant intensity at the detector in terms of $I_0$?