Subtracting the results of a formula

[David A]

In A1 I have this: $9.50.
In A2 I want to display the result of multiplying A1 with 10% and subtracting the result from A1.

I've tried this in A2: =SUM(A1*10%)-SUM(A1)
But it displays a negative number: -$8.55

I need it to display: $8.55

[David A]

OK, I figured it out: =SUM(B98-(B98*10%))

[Paul]

David, couldn't you simplify this to just

=B98*.9

or

=B98*90%

Algebraically, x - .1x == .9x

[David A]

Yes I could. Didn't think about that.

Thanks.