Question

a study of 120,000 randomly selected photos posted to a social media site determined that 4% were \selfies,\ photos of oneself. if the percent of selfies is consistent throughout the rest of the photos on the site, and there are 20 billion photos, how many billions of photos on the site are selfies? show calculator how do i enter a student - produced response on the sat? show me!

Explanation:

Step1: Convert the percentage to a decimal

The percentage of selfies is \(4\%\), which as a decimal is \(0.04\) (since \(4\%=\frac{4}{100} = 0.04\)).

Step2: Calculate the number of selfies

We know the total number of photos is \(20\) billion. To find the number of selfies, we multiply the total number of photos by the decimal - form of the percentage of selfies. So we calculate \(20\times0.04\).

$$20\times0.04=(2\times10)\times\frac{4}{100}=\frac{2\times4\times10}{100}=\frac{80}{100} = 0.8$$

Answer:

\(0.8\)