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How do you write 0.3% as a fraction?
##0.3% = 3/1000##
##0.3%## means ##0.3## per ##100## ##color(white)("XXXXXX") or 0.3/100##
To get rid of the decimal point, multiply both the numerator and denominator by 10, to get ##color(white)("XXX")3/1000##