Dylan has 765 cards in his baseball card collection. He sells 153 of the cards. What is the percent of decrease in the number of cards in the collection?

Question

Dylan has 765 cards in his baseball card collection.  He sells 153 of the cards.  What is the percent of decrease in the number of cards in the collection?

i'm Lost I've been trying for about a good 20 minutes

Scott · Answer

he sells 153 cards out of 765 what fraction (percent) of his cards did he sell