A store sold 850 cell phones last week. this week, the store sold 612 cell phones. whats is the percent decrease in the number of cell phones sold from last week to this week?

28% decrease

Step-by-step explanation:

Percentage Decrease=

(Starting Value − Final Value) / Starting Value x 100

(850 - 612) / 850 x 100 = .28

amount of oatypop that contains the prize = 40%

amount   of oatypop which doesn't contain the prize = (100-40)=60%

probability that hannah will win a prize

    = s +f s +f f s+ff   f s+ff f f s+ infinity.where f= failure,s= success

=   or 60%

probability that hannah only has to buy 3 or less boxes before getting a prize= (s) and ( f s) and (ff s) and (f f f s)

        = = 87.04 %  

step-by-step explanation: