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Answer:

Step-by-step explanation:it is 28 percent because you add all of them together witch makes 75, then you have milana's stamp(21) and divided with the total number(75) so it will be 21/75 or 0.28 so 28 percent.

The percentage of stamp Milana have is 28%

How to determine the percentage?

The given parameters are:

Milana = 21

Matthew = 25

Joley = 29

Calculate the total number of stamps

Total = 21 + 25 + 29

Evaluate the sum

Total = 75

The percentage of stamp Milana have is then calculated as:

Percentage = Milana/Total * 100%

This gives

Percentage = 21/75 * 100%

Percentage = 28%

Hence, the percentage of stamp Milana have is 28%

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