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.
In accouting terms recurring cost are known as revenue expenses which we need to incur on regular basis for example raw material expenses, labour expenses. On the other hand, non recurring expenses are known as capital expenses which are not incurred on regular basis. Once incurred they give long term benefit.