A decimal number is simply a way of representing a number in such a way that the place value of each digit is ten times that of the digit to its right. It may or may not contain a fractional part. If not, the decimal representation does not require a decimal point. So the decimal for 10 g is 10 g! If you want it as a decimal fraction of some other quantity then you need to specify that second quantity.
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25% of 40g= 25% * 40= 0.25 * 40= 10g
Every fraction is an equivalent fraction: each fraction in decimal form has an equivalent rational fraction as well as an equivalent percentage fraction.
A fraction that has a different sign to the first fraction.
Divide the fraction by 100, and you will get the percentage of a fraction.