Here's a look at what causes hair to turn gray and some of the factors that affect graying. Answer: The age at which you'll get your first gray hair (assuming your hair doesn't simply fall out) is largely determined by genetics.
Profits or net income generally imply total revenue minus total expenses in a given period. In accounting, revenue is often referred to as the top line due to its position on the income statement at the very top. This is to be contrasted with the bottom line which denotes net income.
Overhead costs to a company. Sales, general, and administrative expenses are usually recurring; they include things like rent, salaries, and money spent on office supplies. They do not generally include one-time costs. They form one of the single largest expenses a company can incur in its operations. These expenses are included in one category on financial statements and are subtracted from revenue when calculating operating income.