Question Simple Problem - Beginners code

[soapface]

I'm currently doing a school assignment. The aim is to basically find out the amount of animals there are remaining when a certain percentage is wiped out, you then enter the amount of years that the species of animal is declining.
I have 3 textboxes, a calculate button and a label to display my answer.

I'm not 100% what equation to use.
My equation
1000 * (1 - 0.50) ^ 2
1000 animals, they are reducing 50% every year for two years.

The code:

[COLOR=#333333]Code:
Private Sub btnCalculate_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnCalculate.Click
Dim animals, rate, year as Integer
animals = txtAnimals.Text
rate = txtRate.Text
year = txtYear.Text
lblDisplayNum.Text = animals * (1 - rate) ^ year
  End Sub[/COLOR]

It doesn't seem to work, I put 1000, 0.5 and 2 into the textbox fields and press calculate, my answer is 1000. It's stuffed up.
I tried again and put 1000, 10 and 2 and it came up with 81000 as the answer.

 

[IanRyder]

Hi,

Have a look at this:-

VS 2010 Simply Problem - Need help!-VBForums

Here is a tip for you:-
Going elsewhere for help and just ignoring the help already offered by someone somewhere else is just rude in my book so I will not offer anything further.

Ian

 

[soapface]

I replied to the thread ages ago, it just needs to wait for a moderator to accept and I did admire his help.
I think I did solve it just by declaring the 'rate' as a double due to using a decimal place number.

 

[IanRyder]

Then you need to wait for your post to clear on the other Forum. Good Luck.

Cheers,

Ian