Argentina's central bank has raised its main rate of interest to 69.5% as it tries to contain soaring inflation.The bank put up its 28-day benchmark rate by 9.5% percentage points, its second hike in as many weeks.It comes as new figures showed inflation in the country had hit a 20-year high of over 70%. The chart below shows what hyper inflation does to the stock market, it might look good to some, but what is shows is the currency is worth nothing.