Answer:
To find what percent 120 is of 400, we can use either the percent proportion or the percent equation.
Using the percent proportion:
Let x be the percent we are looking for. Then we can write:
120/400 = x/100
Simplifying this equation, we get:
0.3 = x/100
Multiplying both sides by 100, we get:
x = 30
Therefore, 120 is 30% of 400.
Using the percent equation:
The percent equation states that:
part/whole = percent/100
In this case, the part is 120 and the whole is 400, so we can write:
120/400 = percent/100
Simplifying this equation, we get:
0.3 = percent/100
Multiplying both sides by 100, we get:
percent = 30
Therefore, 120 is 30% of 400.