Series & Sequences: Each year a school manages to use only 90% as much paper as the previous year in the year 2000, they used 700,000 sheets of paper.
a) Find how much paper the school used in the years 2001 and 2002.
b) How much total paper did the school use in the decade from 2000 to 2009?

Question

Series & Sequences: Each year a school manages to use only 90% as much paper as the previous year in the year 2000, they used 700,000 sheets of paper.
a) Find how much paper the school used in the years 2001 and 2002.
b) How much total paper did the school use in the decade from 2000 to 2009?

anonymous · Answer

Do you have any idea of a answer?

anonymous · Answer

for 2001 it would be 
$$700,000\times .9$$

anonymous · Answer

for 2002 it would be 
$$700,000\times .9\times .9=700,000\times (.9)^2$$

anonymous · Answer

oh you are asked for the total, sorry
then you would have to add 
$$700,000\times .9+700,000\times (.9)^2$$

agent0smith · Answer

For (b) you can use the geometric sequence sum formula.