# Mathe exercise

A mathe exercise:

We are now going to find the starting amount and the final amount.

Formula:

K = K0 (1 + r)n

r = rate

K0 = starting amount

K = final amount

n = number of periods

 Starting amount Rate Number of periods Final amount 117,00 11 % 5 1000,00 5 % 17 6 % 4 2765,88 17,75 % 10 5789,76

Posted in Group10.

## 8 Responses

Stay in touch with the conversation, subscribe to the RSS feed for comments on this post.

1. We have found the solution :

K=KO*(1+r)n
K=117.00*(1+11%)*5= 649.35

K=1000.00*(1+5%)*17 = 17850

2765.88 = KO*(1+6%)*4
KO = 652.33

5789.76 = KO*(1+17.75%)*10
KO = 491.7
Thank you
Bye Bye

2. your answer to the exercise is wrong, because the rate should be in decimal.
So 6% is 0,06.

Try doing that with all the calculations 🙂

3. Oups !! We are not very gifted. We are a little bit tired so the rigth answer is

K= 117.00*(1+0.11)*5 = 649.35 ?

K= 1000.00*(1+0.05)*17 = 17850 ?!

2765.88 = KO*(1+0.06)*4
KO =652.33 ?!!

5789.76 = KO*(1+0.1775)*10
KO = 491.7 ??!!

We don’t understand we found exactly the same answer. Where is the problem ?

4. okay, now I found the mistake.
You aren’t supose to multiply with n. You need to exalt it in n.
That is why your results are the same as mine.

5. We don’t understand. We must multiply to the power n ?

6. Now we try AGAIN using to the power n :

K = 117.00*(1+0.11)^5 = 197.15

K = 1000.00*(1+0.05)^17 = 2292.01

2765.88 = KO*(1+0.06)^4
KO = 2190.83

5789.76 = KO*(1+0.1775)^10
KO = 1129.92

It’s more logical isn’t it ?
I hope it’s the good answer
I won’t restart all the calcul.

7. now it is right 🙂 good

8. Cool !! We have save our honnor. What is our mark ?
You must give us a good mark because you don’t give all the information. 😉