Ruthenium Polymer Coating is 5000 nuyen per rating. 3 Matches your Sleeping Tiger. So that's 15,000. x 125% is 19,250 + 10% on top of that is 21,175.
Unless that typo meant to read as "I will JUST take the ballistic mask", which you can get your damn self at cost (don't need to send someone nutzo after it)