Parallel rays of monochromatic light with wavelength 589 nm illuminate two identical slits and produce an interference p

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Parallel rays of monochromatic light with wavelength
589 nm illuminate two identical slits and produce an
interference pattern on a screen that is 75.0 cm from the
slits. The centers of the slits are 0.640 mm apart and
the width of each slit is 0.434 mm
Part A
If the intensity at the center of the central maximum is
4.20×10−4 W/m2 , what is the intensity at a
point on the screen that is 0.900 mm from the center of
the central maximum?
Express your answer with the appropriate units.