If you invested $5,000 a year in a product (which has a mix of shares and fixed interest) with fees at 3%, you could pay $25,640 after tax in fees after 20 years.
Shares and equities refer to the same thing - a share in the ownership of a company and entitlement to any distributions (eg dividends).
Money paid in return for the use of money. If the bank is using your money (in a savings account) they pay you interest. If you are using the bank's money (via a loan), you pay the bank money.