The amount a pool repairman charges for each job is represented by the function p=65h+45, where h represents the number of hours he spent on the job, and p represents the total amount he charges in dollars for the job. The repairman plans to change the amount he charges for each job represented by the function p=75h+45.
What will be the effect of this change on the amount he charges for each job?

A. The amount he charges per hour will increase by $10.
B. The amount he charges for each job will decrease by $10.
C. The amount he charges per hour will decrease by $10.
D. The amount he charges for each job will increase by $10.