The video memory has the capacity to store a 640 x 480 4-color image. How large the image can be stored

The video memory has the capacity to store a 640 x 480 4-color image. How large the image can be stored in the same amount of video memory using a 256-color palette?

A 640 by 480 pixel image contains 307,200 pixels. One 4-color dot occupies two data bits. This means that the video memory must have at least 307200 * 4 = 1228800 bits = 153600 bytes = 150 kilobytes.

One 256-color pixel takes up 8 bits of memory. You can divide the previously calculated memory size by this number: 1228800/8 = 153600 points.