Explanation:
The journal entries are shown below:
a.
Petty cash A/c Dr $750
     To Cash A/c $750
(Being the establishment of petty cash is recorded)
b.
Office supplies $248
Miscellaneous selling expense $212
Miscellaneous administrative expense  $96
Cash short and over $18 Â Â Â Â Â ($750 - $556 - $176)
           To Petty cash A/c $574
(Being the replenishment of petty cash fund is recorded)