Mr. Rico bought toilet paper at $2.25 per roll and a liter of hand sanitizer at $12.50. If T is toilet paper rolls and C is the total cost, write an expression to represent this situation.

What changes may occur if the given dollar will be rounded off to its nearest value.
There will only be 2 chances, the dollar will become smaller or bigger. Why? 
Because in mathematical rules of rounding off numbers:
number below 5 will be round down and 5 and up will be rounded up.
For example:
You have a bill of $6.79  since the number next to the decimal point in the right is 7, it will be rounded up to $7.
But if your bill is $6.25, it will be rounded down to $6.00 

I got this from a different brainy member