URGENT: Probability of 2 Sales Stages as 100%

Hi All,

Currently there are 7 Sales Stages & the requirement is to remove the 4th stage and simultaneously raise 5th stage probability to 100%. So, removal of sale stage is fine however my main question is can we have 2 sales stage with same probability i.e. 100%. Because Probability for Sales Stage: Won is 100% by default & as per requirement 1 more stage needs to be with probability 100%.

Current Setup:

A -> 1        Probability -> 20%

B -> 2        Probability -> 50%

C -> 3        Probability -> 70%

D -> 4        Probability -> 80%    ----> Removal of this Sales Stage

E -> 5        Probability -> 90%    ----> Change this stage probability from 90% to 100%

F -> Won   Probability ->