Math Challenge For Pharmacists

Can you solve this math program for preparing a liquid solution?

Submitted by

Kenny

Patient's prescription is for acetic acid 0.25% to be applied to affected area once daily. Total quantity to be dispensed is 200mL.

You are presented with a 500mL bottle of 5% acetic acid.

What volume of the 5% acetic acid should be added to what volume of distilled water to make the desired product?