I believe there's a misunderstanding in your request. "What is a 78 percent 75 percent" doesn't represent a standard mathematical or statistical concept. It's unclear what you're asking for. To help me understand, please clarify:
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Are these two separate percentages? If so, what do they represent individually? For example, are they scores on two different tests, or proportions of two different things?
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Is there a relationship between the two percentages? Are they related in some way (e.g., one is a percentage of the other)?
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What context are these percentages from? Knowing the source will help me understand what you're looking for.
Once you provide more information, I can give you a more helpful and accurate response.