Help needed for formula

Can anyone help with this example:

In my shop, I started a Sale halfway through the month.

On one item I sell, I reduced the price from £3 to £2.  I took a total of
£100 in sales for this item.

Is there a formula which  will tell me how many I sold at £3 and how many I
sold at £2?

TIA

-- 
Slartibartfast
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