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.
On the other hand, a company's net income or profit is determined by subtracting its expenses from its revenues. Thus, revenues are the opposite of expenses, and income equals revenues minus expenses. For example a store may sell $300 worth of merchandise, for which it originally paid $200. In that example the company's revenue is $300, its expense is $200, and its net income or profit is $100. Other expenses that are typically deducted from sales or revenues include salaries, rent, utilities, depreciation, and interest expense. When looking at a company's income statement, it is easy to distinguish between revenues, which appear at the top of the statement, and net income, which appears at the bottom.