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6. If Martin invests $20,000 for 20 years and his investment earns 20% interest compounding quarterly, what will it be worth at the end of his investment period?

7. To find the percentage (p) of any number (n), which formula can be used?

8. In a game, one card is drawn from a complete deck of playing cards without jokers. If the card is a club or a queen, the gambler wins double his bet. Otherwise, the dealer keeps the money. How much better are the dealer's odds in this game?

9. What is the mode for the following set of numbers? 27, 29, 26, 25, 24, 22, 26, 21, 23, 28

10. Using data to predict what might occur in the future, beyond what the data set has explicitly demonstrated, is called: