applications of series? (1 Viewer)

[da_butterfree]

hey.. i am just facing some problems with applications of series... especially the loan repayments and supers!!
please help!!

 

[Estel]

It would help if you posted the questions...

 

[abdooooo!!!]

Originally posted by Estel
It would help if you posted the questions...

it would but i don't see why its neccesary.

money is good and supers is expensive.

 

[Xayma]

Just work on one line at a time.
For super

A₁=P(1+r/100)
A₂=(P+A₁)(1+r/100)
=P([1+r/100][1+r/100]²)
etc.

 

[da_butterfree]

i can do it manually, but how do i form a series?? and how do i know if it is an arithmatic or a geometric series?

 

[Xayma]

Super and time repayments will be GP's, anything with the compound interest formula will be a GP.

When you get to the end one (say term 30)

You will have P([1+r/100]¹+[1+r/100]²+[1+r/100]³...[1+r/100]³⁰)

Which is a GP with first term 1+r/100 30 terms and with a common difference of 1+r/100.

 

[CM_Tutor]

1. Define your terms to start, if they aren't defined by the question.

2. Keep your setting out and working clear

3. Put in all the steps - don't skip over bits because you think you remember how the algebra will come out.

I can post an example if anyone would like...

 

[Jennibeans]

AP have a common DIFFERENCE e.g. 1,3,5,7,9 see the difference is 2
GP have a common ratio e.g. 3,9,27,