C because there are 60 seconds in a minute so if you multiply 600 x 60 you get 36000
It is equal because every 2000 pounds is 1 ton and 18000lb divided by 2000 equals 9.
, assuming they mean pre eat values.
2. 
You would turn 15% into a decimal. Which would be .15, and then do .15 times $29.99 which is $29.84. Then you would subtract the $29.99 minus the $29.84