Question

*math please help*

Answer 1

This percentage can be calculated as part / whole:
$p = \frac{900000000}{3500000000} \\ p = 0.257$

Approximately 25.7 percent.

Answer 2

If we are going to find the percentage of a total body that a specific group of something makes up, we are going to want to divide the frequency of the specific body by the frequency of the total body. Essentially, divide the specific number by the total number. After you have done this, multiply by 100 and add a % sign.

In this case, the specific number would be 900 million, since that is representing the frequency of the smaller group. The total number would be 3.5 billion. Dividing will give us:

$\dfrac{900,000,000}{3,500,000,000} = \dfrac{9}{35}$

Multiplying by 100 will give us:

$\dfrac{9}{35} \cdot 100 = \dfrac{900}{35} \approx 25.7 \,\%$

Our answer is 25.7%.