$50 an hour is a a. salary b. commission c. wage d. pension

Salary is a fixed compensation for the agreed-upon working hours.  If there are extra hours worked, or reduced hours, for whatever reason, his does not receive extra or reduced compensation.

Wage is paid by the number of hours worked.  Therefore wage is directly proportional to the workhours, with the exception of holidays and sick leaves, if any is granted.

Commission is paid according to the performance, not the number of hours.

A pension is not related to the current number of hours worked, but mostly related to the length of service within the organization.