If the selling price per unit and the variable cost per unit both increase by 5%, what is the effect on the contribution margin per unit and on the contribution margin ratio? 
Definitions:
Debriefing Session
A meeting held after the completion of a study where participants are informed about the study's purpose and their role in it.
Straightforward Manipulations
Simple and direct changes or interventions applied to the independent variable of a study to observe effects on the dependent variable.
Manipulation Check
A procedure to determine if the experimental manipulation of the independent variable has the intended effect on the participants.
Independent Variable
The variable that is manipulated to observe its effect on the dependent variable.
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