To heip farmers and gardeners, commercial fertilizers have a big three-number "NPK" label on the bag that gives the amounts of three key plant nutrients: nitropen, phosphorus and potassium. For example, a bag of "10-10-10" fertilizer has 10% by mass nittogen, 10\% by mass potassium as potash ( K2O ), and 10% by mass phosphorus as phosphate (P2O5) Suppose a certain fertilizer has the following composition: What should the first (nitrogen) number on the bag label be? That is, calculate the percent by mass of nitrogen in this fertilizer. Round your answer to the nearest percent