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math doubts [NEW]

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Ghost Of Highbury:

--- Quote from: simba on October 14, 2009, 04:44:15 pm ---guyz another question ....num.4 in nov.07

will someone help :???

--- End quote ---

A level maths --> paper no?

simba:
its paper 1 ...pure 1

badboy:

--- Quote from: astarmathsandphysics on October 13, 2009, 09:46:09 pm ---each year a company gives a grant to charity. The amount given each year increases by 5% of its value in the preceding year. The grant in 2001 was $5000. Find :

(i) the grant given in 2011
(ii) the total amount of money given to the charity during the years 2001 to 2011 inclusive
i)
ii)

--- End quote ---



ur answers r wrong i) 8144 ii)71034

slvri:

--- Quote from: badboy on October 14, 2009, 05:11:41 pm ---

ur answers r wrong i) 8144 ii)71034

--- End quote ---
(i)the grant given in 2011 should be the 11th term
the 11th term is given by a11=arn-1=5000*1.0511-1=5000*1.0510=$8144
(ii)total amount is the sum of the money from 2001 to 2011
so the sum from terms 1 to 11 is S11
=a(1-rn)/1-r
=5000(1-1.0511))/1-1.05
=5000(1-1.0511)/-0.05
=$71034
hope this helped :)

astarmathsandphysics:
Sod it you are righht. I shouldn't do these questions first thing in the morning.

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