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heres a formula dont know if its right but 49.5 is the answer.
How to Calculate Percentage in Excel using Formula?
The excel formula for percentage is Portion Days / Total Days * 100.
Percentage of Days spent in USA = 5 / 15 * 100 = 33.33%
Percentage of Days spent in Home Town = 10 / 15 * 100 = 66.66%