problems with numbers

Ok. Real Quick. What is the best Data Model for the following types of values? (Access 2000)

"Hello" (I'm using Text for this)
"Insert a LOT of information here" (I'm using Memo for this)
0/1 (I'm using Number-Byte for this)
43 (I'm using Number-Long Int for this)
4.23 (I'm using Number-Double for this)

A problem I'm having with my math and ASP/VBscript is this.

What I want to do is take X% off the price of a object. So I do this

price = rsProducts("prodPrice")
' the value of price is 85

percentOff = rsProducts("prodPercentOff")
' the value of percentOff is 10

tmpAmountOff = ((price - 0.00) / 100) * (percentOff - 0)

Sure enough, if I output tmpAmountOff, I get 8. Which is wrong (should be 8.5) So what am I doing here? Wrong datatypes? Wrong math?

I want the final numbers here to be decimal, and rounded at the second decimal place. I SHOULD get 8.5 back. And then I can use

Response.Write("You saved : " & FormatCurrency(tmpAmountOff, 2,-2,-2,-2)

Which should say:

You saved : $8.50

Any help? My thanks in advance!