Answer:
March 1:
Petty Cash A/c    Dr. $300
To Cash                $300
(To record petty cash fund)
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March 31:
Office Supplies A/c      Dr. 137
Selling expenses A/c    Dr. 112
To Cash ($300 - $64) Â Â Â Â Â Â Â Â Â Â Â Â $236
To  Over/Short                   $13
(To record any discrepancy in the cash short and over account)