While pursuing the elusive Fountain of Youth in the Caribbean, Captain Jack Sparrow envisioned a retail store that specializes in pirate-themed merchandise, such as pirate swords, pirate clothing lines, out-of-order compasses, and navigational maps. After a lucrative career as a pirate, he opened his first store, The Black Pearl, in New Orleans that he had envisioned. In 1817, his store had net sales of $850,000, cost of goods sold of $580,000, and total expenses of $120,000 and paid $5,000 for taxes. What was the store's net profit margin (in %)? 17.1% 13.7% 21.3% 8.5%