After selling 72 articles a man earns a profit equals to selling price of 9 articles. Find the profit %.

\(11\frac{1 }{9}\)% \(18\frac{2 }{7}\)% \(12\frac{2 }{5}\)% \(14\frac{2 }{7}\)%

\(14\frac{2 }{7}\)%

72S - 72C = 9S          72C = 63S            8C = 7S              C = 7              S = 8 Profit % = \(\frac{1}{7}\) × 100 = 14\(\frac{2}{7}\)%