Telangana PSC Group 2 Prelims 2016 Paper 1

In the following question a number series is given. After the series a number (25) is given followed by (A), (B), (C) and (E). You have to complete the series starting with the given number following the sequence of original series and answer the question.
10,   15,   30,   75,   225,   787.5   
25,   (A),  (B),  (C),  (D),    (E)
Which of the following is not correct?