40 and there is absolutely no need to add the decimal point. Furthermore, adding a 0 after the decimal point is wrong because that implies that the number is accurate to a tenth - and there is o justification for that level of accuracy.
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0.40
40% = 0.4
40% = 0.40
11/40 = 275/1000 So you would WRITE 3 and 11 over 40 as 3.275
decimal .4 percent 40%