titration concentration question

In a lab we had added 5.3 ml 50% NaOH to a 1L bottle and filled with water. We then added .4038 g of KHP (MW 204.23) to a flask, added 30 mL of water to flask and dissolved KHP. A titration of KHP with NaOH required 20 mL of NaOH. What is the concentration (in molarity) of the NaOH used in each t…