How Leverage Affects Transaction Costs

Beginner Questions
1

Hello, I´m reading this articel: How Leverage Affects Transaction Costs - BabyPips.com

Any ideas how to calculate these numbers from the chart?

For example:
Leverage: 3:1
Margin required: $3,300
Cost as % of margin: 0.10%

With what deposit do they start here for example? Above the have started with 500$ but I dont know how they get these numbers.