7. An individual savings account (ISA) is a financial product, allowing customers to avoid paying tax on savings up to £5,640. One customer has £5,000 in an ISA and another customer has £5,000 in a regular savings account. If both savings accounts pay 3% interest (paid once annually) and both customers pay 20% income tax, how much more interest is earned by the customer with the ISA in 1 year? (income tax is paid on regular interest payments, not ISA's)