Answer:
126
Step-by-step explanation:
A group of store managers must assemble 280 displays for an upcoming sale.
Displays assembled in first hour = 25 percent of the displays = ![25\% \times 280](https://tex.z-dn.net/?f=25%5C%25%20%5Ctimes%20280)
Displays assembled in first hour= ![\frac{25}{100} \times 280 =70](https://tex.z-dn.net/?f=%5Cfrac%7B25%7D%7B100%7D%20%5Ctimes%20280%20%3D70)
Remaining displays =280-70= 210
We are given that 40 percent of the remaining displays during the second hour
Displays assembled in second hour= ![\frac{40}{100} \times 210 =84](https://tex.z-dn.net/?f=%5Cfrac%7B40%7D%7B100%7D%20%5Ctimes%20210%20%3D84)
Displays assembled in first hour and second hour = 70+84=154
Remaining displays = 280-154 = 126
Hence 126 of the displays will not have been assembled by the end of the second hour