A percent is a mathematical concept used to express a number as a fraction of 100. It is represented by the symbol “%”.

Answer: 30% of 400 is 120.

To calculate 30% of 400, you can follow these steps:

1. Convert the percentage to a decimal by dividing it by 100. In this case, 30% becomes 0.30.
2. Multiply the decimal by the number you want to find the percentage of. In this case, 0.30 multiplied by 400 equals 120.

0.30 × 400 = 120.

So, 30 percent of 400 is 120.

This calculation is a straightforward application of the concept of percentages. When you want to find a certain percentage of a number, you convert the percentage to a decimal and then multiply it by that number. In this example, 30% of 400 is 120, which means that 30% of the total value of 400 is equal to 120. Percentages are widely used in various fields such as finance, statistics, and everyday life for representing proportions and making comparisons between different values.