Acity collects property taxes on vehicles at a rate of $3 for every $100 of the assessed value beyond $10,000 (the first $10,000 is exempt from tax). fred owns a car whose assessed value is $25,000. how much property tax does fred pay for his car?

He pays $450 in taxes.

Since the first $10,000 of the assessed value is exempt, we subtract $10,000 from the $25,000 assessed:
25000-10000=15000

Now we need to see how many $100-increments are in 15000.  We do this by dividing:
15000/100 = 150

Each of these raises the taxes by $3:
150(3) = 450