The number gained when money is invested is called interest.
Interest is a fee, paid on borrowed capital.
example, An interest rate of 7% per year means that every
$100 invested gains $7 interest at the end of the year.
interest is calculated upon the value of the assets in the
same manner as upon money. Interest can be thought of as rent
on money. For example, if you want to borrow money from the
bank, there is a certain rate you have to pay according to
how much you want loaned to you.