formula to calculate percent

I need a formula that calculates the percentage that field 1 is of field 2. For instance: I have a number field that the sales rep will put a number in. I want to make a formula field that takes that number and calculates the percentage of the opp total field. (Field 1 has 2,700.00. Opp total is 4,500.00. since 2,700.00 is 60% of 4,500.00 then I want Salesforce to put 60% in the new field.

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