Ordinary Annuities and Annuities help

Could you plz show me how the formula for these problems work

R=1400 10% per year compounded quarterly for 8 years
Answer in the back of the book: 1st part $67,410.39 2nd part: $22,610.39

R=$800, 9% per year compounded monthly for 4 years
Answer in the back of the book: 1st part$46,016.57 2nd part $7616.57

The problems below are compounded annually
R=$1200 i= 0.075 n=8
Answer in the back of the book: 1st part $13475.82 2nd part $3875.82

R=$17,544 i=0.08 n=6
Answer in the back of the book: 1st part $138,997.66 2nd part $33,733.66

What formula are you using?
Show your work.
Plus your problems are unclear: are they annuity immediate? What's 1st part, 2nd part?

Quote:

---

Originally Posted by Wilmer

What formula are you using?
Show your work.
Plus your problems are unclear: are they annuity immediate? What's 1st part, 2nd part?

---

The top two are ordinary annuity problems you have to find the value of by second part answers you have to find the total amount of interest earned subtracting/dividing or etc (you can ignore if you want). The bottom two are annuity due problems. My bad about not being specific enough.

Asking AGAIN Johnny: what formula are you using?

Quote:

---

Originally Posted by Wilmer

Asking AGAIN Johnny: what formula are you using?

---

I'm not sure, probably the Future value.

This is what it shows in my book for the those problems in the Opening post:

Attachment 23012
http://www.credit-card-customer-care...alculator.html

That's correct. Let's apply it to your 1st question:
"R=1400, 10% per year compounded quarterly for 8 years;
Future Value: $67,410.39 , total interest: $22,610.39"

F = Future value (?)
R = quarterly deposit (1400)
N = Number of quarters (8*4 = 32)
I = Interest per quarter (.10 / 4 = .025)

F = R[(1 + I)^N - 1] / I

F = 1400(1.025^32 - 1) / .025 = 67410.3885...

Total interest = Future value - total deposits
= 67410.3885... - 32*1400 = 22610.3885...

Study and master that...then go apply for job as Financial Analyst (Itwasntme)

@wilmer

lol no chance in hell ^^

thx for the help