Using percentages we know that 20% is Miguel's profit as a percentage of the cost price.
So, the profit is $25.
We know that Miguel paid $125 for stamp collection.
Now, the profit Miguel made from the cost price:
25/125 × 100
0.2 × 100
20%
Therefore, using percentages we know that 20% is Miguel's profit as a percentage of the cost price.
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