OK, try the following.

The $A1 reference means that column A is locked or fixed. This means that if
you copy a formula, to the right, it will alsways use the values from column
A, but copying down, it will move down the row references.

If it read A$1, then it means that Row 1 is locked. If you copy the formula
down rows, it will always use the cells from the row. If you copy the formula
o the right, the column references will update

Setup a sheet looking like this
A B C D
1 10% 20% 30%
2 10 =$A1*b$1
3 20
4 30

Copy the formula down and to the right, and look at the column and row
references

Hope this helps
Eddie
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"ET" wrote:

Sorry, having trouble understanding $A etc