Problema Solution
Chasity loves gummy bears so much that after returning from Costco with some gummy bears, she eats 25% of the gummy bears she just bought. The next day she eats 25% of the remaining gummy bears and continues to eat another 25% each day. What percent of the gummy bears will Chasity have left after nine days? (Round your answer to the nearest whole percent.)
Answer provided by our tutors
This could be done manually, starting with 100 gummy bears and reducing the number by 25% over nine days:
>>> 100*0.75
75.0
>>> 75*0.75
56.25
>>> 56.25*0.75
42.1875
>>> 0.75*42.1875
31.640625
>>> 0.75*31.640625
23.73046875
>>> 0.75*23.73046875
17.7978515625
>>> 0.75*17.7978515625
13.348388671875
>>> 0.75*13.348388671875
10.01129150390625
>>> 0.75*10.01129150390625
7.5084686279296875
So on the 9th day there are approximately 7.51%, which rounds to 8% of the gummy bears remaining.