Oh come on! If the price didn't end in 9/10th the price would be rounded to the next higher penny (1/10th increase) not the next lower penny.
Then the price goes up at the next higher 3.45 9/10 becomes 3.46 which jumps again to 3.46 9/10 and so on. But then you get into the formula estimated of cost of the # gals that make up one barrel of oil, the # of barrels, per month, per year, revenues, estimates etc in the present year.