Answer and Explanation:
The Journal entry is shown below:-
August 1
Petty Cash Dr, $100
To Cash $100
(Being establishment of petty cash fund is recorded)
August 31
Postage expenses Dr, $31
Office supplies Dr, $42
Miscellaneous expenses Dr, $16
Cash short and over $4
($100 - $31 - $42 - $16 - $15)
To Cash $93
(Being petty cash fund replenished is recorded)
Petty Cash Dr, $93
($100 - $7)
To Cash $93
(To record reimburse the fund)