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Derive 99 using each of the digits 2,3,4 and 5 once only?
I was given a puzzle to do which involves using the digits 2,3,4 and 5 once only in an equation to derive all the numbers from 1 to 100. I did it, but 99 proved to be the difficult one to answer. Can anyone out there derive 99 using the four digits. Any mathematical method/symbology is allowable, only constraint is to use the digits once only?
Examples of equation construction
(5-4) x (3-2) equals 1
52 + 34 equals 86
(3 x 2) x (4 + 5) equals 54