I am struggling to answer a question, please could someone help explain this is simply as possible! Here is the question:

The revenue generated by a new software in detecting plagiarism amongst student’s work in 2004 was £2.1m. The same software in 2005 now generated £2.3m.

If the RPI was 186.7 in 2004 and

192.0 in 2005,

what is the real increase in revenue?

Give your answer to 2

decimal places. (If the answer is £5.45m then just enter 5.45).