Question

the graph below shows the number of downloads, in millions, for various social networking apps. source: department of defense (a) which app had the largest percent increase between the two years? tiktok instagram snapchat facebook (b) what was the percent decrease between the two years for facebook? round to the nearest tenth of a percent. %

Explanation:

Step1: Calculate percent - increase formula

The formula for percent increase is $\frac{\text{New Value}-\text{Old Value}}{\text{Old Value}}\times100\%$.

Step2: Calculate percent - increase for TikTok

For TikTok, old value in 2020 is 89 million and new value in 2021 is 94 million. Percent increase $=\frac{94 - 89}{89}\times100\%=\frac{5}{89}\times100\%\approx5.6\%$.

Step3: Calculate percent - increase for Instagram

For Instagram, old value in 2020 is 62 million and new value in 2021 is 64 million. Percent increase $=\frac{64 - 62}{62}\times100\%=\frac{2}{62}\times100\%\approx3.2\%$.

Step4: Calculate percent - increase for Snapchat

For Snapchat, old value in 2020 is 51 million and new value in 2021 is 56 million. Percent increase $=\frac{56 - 51}{51}\times100\%=\frac{5}{51}\times100\%\approx9.8\%$.

Step5: Calculate percent - increase for Facebook

For Facebook, old value in 2020 is 52 million and new value in 2021 is 47 million. Since it's a decrease, we first calculate the percent - decrease formula $\frac{\text{Old Value}-\text{New Value}}{\text{Old Value}}\times100\%$.

Step6: Calculate percent - decrease for Facebook

Percent decrease for Facebook $=\frac{52 - 47}{52}\times100\%=\frac{5}{52}\times100\%\approx9.6\%$.

Answer:

(a) Snapchat
(b) 9.6%