I got this one wrong as well. After a lot of swearing, pens being snapped and calculators thrown across the room I think I decided that as the cash had increased from £150 to £250 then not all of the cash sales were paid into the bank and the cash sales must have been £163,600 (with £163,500 going into the bank). I asked on here if this was correct but I don't think it was ever answered.
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