In total, you have
$668.00.
To reserve enough for the last day, you need to subtract the last day's budget:

This means that, for the remaining
6 days in the week, you have
$583.00.
Assuming an equal amount is being spent each day, you can calculate the daily budget by dividing the
remaining total by the
number of days left.

To avoid going over budget, you can spend
$97.16 per day
for the other six days.
Hope this helps!