A store owner has three items on sale namely, a hanger for P$50,$ a watch for P$30,$ and a ballpen for P$1.$ At the end of the day, he has sold a total of $100$ of the three and has taken exactly P$1000$ on the total sales. How many hangers were sold?

A$.20$

C$.28$

$($B$.)16$

D$.18$