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Like pi the value of e is an irrational number and to 3 decimal places it is 2.718
e = 2.718
E
E is not used as a symbol in the roman numeral system.
To find the exact value you could:use exact values rather than estimates - as inputs;use exact formula instead of approximations,use calculus.There are other methods as well and the choice depends on the circumstances. Then, if Y is your value and E is the exact value,percentage error = 100*(Y - E)/E or 100*(Y/E - 1).