Economics - Monopoly

Can someone give the numerical example to show that a monopolist's marginal revenue can be upward sloping over part of its range: The price on the demands curve is the producer's average revenue.
Thanks if u cn help.

Unlike a competitive market, a monopoly's marginal revenue that it gets from selling an additional unit will always be less than the price the unit is sold for.

http://economics.fundamentalfinance.com/micro_revenue.php