Simple English: (how to work out a percentage of something).
100% means everything. I put in 100% when I ran a race. I put in everything when I ran a race.
To work out a percentage of anything you need to first divide the number by 100.
So if you had to work out 20% of 10 you would take...

a = 1
Question: What is a?
Algebra Answer: 1
Computer Programming Answer: a is a label of a box and inside the box is the number 1
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Question: What is the =
Algebra Answer: equals whatever the sum of the calculation is.
Computer Programming Answer: Whatever comes after the equals (on the right of it) goes into the box (on the left of it)...
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C# Constructors explained in this sample tutoring session.