Final answer:
After 7 days, a violator would have to pay $135 for a 'No Valid Permit Displayed' citation, which includes the $100 base payment and an additional $35 for the late payment charges.
Step-by-step explanation:
If a 'No Valid Permit Displayed' citation costs $100 and the charge for late payment increases by $5 a day after the initial 7 days, then we can calculate the total amount due after 7 days. The initial base payment is $100, and for every day that passes after the issuance of the citation, an additional $5 is added to the total cost.
For 7 days, the calculation would be:
- 7 days x $5/day = $35
- Base payment + Late payment = Total payment
- $100 + $35 = $135
Therefore, after 7 days, a violator would have to pay a total of $135.