In 1999, total revenue of a company from music sales and licensing was $14.2 billion. It was forecasted that this number would continue to drop until it reached $5.3 billion in 2014. Find this percent decrease in music revenue.
The percent decrease in music revenue is [%.
(Type a whole number or a decimal rounded to the nearest tenth as needed.)

Martha has a deck of cards. she has lost some of the cards, and now the deck only contains nine spades, eleven diamonds, eight clubs, and twelve hearts. martha predicts that whenever she draws a card from the deck without looking, she will draw a club one-fifth of the time. which activity would best allow martha to test her prediction? a. randomly draw a card from the box and see if it is a club. b. randomly draw a card. then, continue to draw another card until all eight clubs are drawn. c. randomly draw and replace a card 120 times. then, observe how close to 30 times a club is drawn. d. randomly draw and replace a card 100 times. then, observe how close to 20 times a club is drawn.