Which of the following expressions could represent the number of hours Rob actually spent on the project:

A: 5 h

B: (h/25) 1.25

C: 1.25 h

D: 4 h

E: (1+ 25/100) h

In the solution they set up the answer by starting with h/.25

Why would we need to calculate what 25% of "h" which is the extra time spent? It makes no sense to determine what 25% of the extra time is since "h" IS the extra time spent.

Any help would be greatly appreciated since I'm at a loss here. (Doh)