As per the Canada Revenue Agency (CRA), you must report the new quantity and ACB of the shares, rather than the old one. Therefore if 160 shares have then received a reverse-split, and for example purposes the price per share was $10, after the reverse-split it will become $100, you will report a quantity of 16 and an ACB of $100 per share, and then the proceeds of whatever new price you sold it at. All of this information can be found on the CRA article: Stock splits and consolidations.
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