Final answer:
The designer would have to make 32 pages in order to save time using the new software.
Step-by-step explanation:
To calculate how many webpages the designer would have to make in order to save time using the new software, we need to find the difference in time it takes to make each page between the old software and the new software.
With the old software, it takes 1.5 hours to make one page. With the new software, it takes 1.25 hours to make one page. This means that the new software saves 1.5 - 1.25 = 0.25 hours per page.
Since it takes 8 hours to learn the new software, the designer will start saving time after they have made 8 / 0.25 = 32 pages using the new software.
Therefore, the designer would have to make 32 pages in order to save time using the new software.