Which percentage is equivalent to the decimal 1.25?

To convert a decimal to a percentage, you multiply the decimal by 100. Therefore, to convert 1.25 to a percentage, the calculation would be as follows:

1.25 * 100 = 125.

This tells us that 1.25 is indeed equivalent to 125%. The process of moving the decimal two places to the right effectively changes the format from decimal to percentage, which is why multiplying by 100 is crucial in this conversion.

Thus, the correct answer reflects this mathematical transformation.