To find what percent 8.40 is of 8, use the formula:

Percent=(8.408)×100\text{Percent}=\left(\frac{8.40}{8}\right)\times 100Percent=(88.40​)×100

Calculate:

8.408=1.05\frac{8.40}{8}=1.0588.40​=1.05

1.05×100=105%1.05\times 100=105%1.05×100=105%

So, 8.40 is 105% of 8.