Check Point Answer

1. Since the image should be 10 inches on a 15 inch screen set at 800 pixels,  the horizontal pixel dimension would be (10x800)/15 =  600 pixels.
Scanner resolution = 2 x required image width (pixels)  / original width (in) 
                                 = 2 x 600 / 10 = 1200 / 10 = 120 dpi

2. File Size = (pixel dimensions x bit depth) / 8
The horizontal pixel dimension is 600 pixels; the 5inch side would be (5/10)x600=300 pixels.

File Size = (600x300x16)/ 8 = 360,000 bytes or approximately 0.360 MB