Solution:
(a) Cash to be accounted for exceeds cash on hand by $52.78.
Cash to be accounted for is $7,146.30 .
That means cash on hand is short by $52.78.
Dr Cash $7,487.51
Dr Cash over and short $57.71
Cr Sales $7,545.22
(b) Cash on hand exceeds cash to be accounted for by $29.45.
That means you have a cash overage of $29.45
Dr Cash $7,590.10
Cr Sales $7,545.22
Cr Cash over and short $29.45