Answer : $95.83
If you have $660 left and you need to spend $85 on the last day, then you have $660 - $85 = $575 to spend on the remaining 6 days.
To calculate how much you can spend per day on average, you can divide the remaining budget by the number of days:
$575 ÷ 6 days = $95.83 per day
So you can spend approximately $95.83 per day on average for the remaining 6 days.
Hope this helps. Have a great day!