Answer:
1. 20%
2.

Explanation:
We can use percentage proportions to find out these answers.
For number one, 10 is what percent of 50, we already know our two values so we can make the equation:

Using the cross products property, we know that x is
which is 20.
So 10 is 20% of 50.
For number two, we know a different pair of two numbers now: we know the percent of x, and the percent it is, so the equation can become:

Again, cross products property tells us that x is
, which is
.
Hope this helped!