Answer:
20%
Explanation:
Step one: divide how much you have by how much you need. The result is 0.2.
Here you have multiple way to remember how to do, pick the one you like most.
a. turn it in a fraction: 0.2 = 2/10 = 20/100, or 20%.
b. multiply by 100: 0.2x100 = 20, so 20%