100 ! you will be marked brainiest

question:

which of the following statements are equivalent to the statement "price increased by 1/2 "?

choose all correct answers.

(a) the price doubled
(b) the price is 150% of the price before
(c) the price was reduced by a quarter
(d) the price became a half of what it was before
(e) the price is now 1.5 of what it was before
(f) the price now is 66 2 3 % of what it was before
(g) the price now is 200% of what it was before
(h) the price is 75% of what it was before

In a test for esp (extrasensory perception), a subject is told that cards only the experimenter can see contain either a star, a circle, a wave, or a square. as the experimenter looks at each of 20 cards in turn, the subject names the shape on the card. a subject who is just guessing has probability 0.25 of guessing correctly on each card. a. the count of correct guesses in 20 cards has a binomial distribution. what are n and p? b. what is the mean number of correct guesses in 20 cards for subjects who are just guessing? c. what is the probability of exactly 5 correct guesses in 20 cards if a subject is just guessing?