The Johnson's Company had net income(after tax) = 500,000 USD, Johnson's Company's income statement included Income Tax Expense = 150,000 USD; Interest Expense = 50,000 USD. Also we know that at the beginning of the year the Johnson's Company's stockholders equity = 2,200,000 USD and at the end of this year stockholders equity = 2,800,000 USD. What is the after-tax return on stockholders equity for the Johnson's Company for this year?