Answer:
The original price of the tent = $320
Step-by-step explanation:
Let the original price be =$ 
Discount offered =
% of the orignal price = 
Original price is $80 more than sale price
Discount = Original price - Sale price = $80
So, we have

We need to solve for
to find original price
Dividing both sides by 

∴ The original price of the tent = $320
You would have to divide 1644 by 12 to find the monthly rate. 1644/12=137, so property tax per month is 137.
1 week = 7 days
1 gallon = 16 cups ⇒ 1 cup = 1/16 gallon
1.5 cups = 1.5 · 1/16 gallon = 15 · 1/160 gallon = 3/32 gallon
1.5 cups per day = 3/32 gallons per day = 7 · 3/32 gallons per week
= 21/32 gallons per week