A sample consisting of Na2CO3 and NaHCO3, and inert matter weighs 3.8579 grams. It is titrated with 0.09 N HCl with phenolphthalein as the indicator, and the solution became colorless after the addition of 17.18 mL. Another duplicate sample was titrated with HCl using methyl orange as indicator. It required 52.02 mL of the acid for the color change. What is the percentage of NaHCO3 (84g/mole) in the sample? (Answers should be written in 2 decimals place and do not include the UNIT)