Two Different Slits

Light of wavelength λ = 450 nm illuminates two slits as shown. Slit A has a larger opening than slit B. The center of slit A is at y = 0, and the center of slit B is at y = d = 0.1 cm. The screen is L = 1 m away from the plane of the slits. When slit A is open and slit B is closed, the light intensity on the screen is I_A = 16 W/m². When slit B is open and slit A is closed, the light intensity on the screen is I_B = 9 W/m².

When both slits are open and ignoring diffraction, what is the ratio between the minimum and maximum intensities on the screen, I_min and I_max?

I_min/I_max =