You will subtract 105.60 minus the regular cost which is 75$. 105.50-75 = 30.60. Now you now he went over by 30.60$. When you divide 30.60$ by the .30$ (which is the cost of every minute after 1,000) it will give you 102. He used 102 minutes.
The sum of 5+2=7 The sum of 2+5=7 The sum is the same because basically, the position and location of the numbers do not matter in <em>addition </em>and multiplication. However, the position matters in subtraction and division.