How many Mb are in a Gb?

I'm in a discussion at the Starbuck's in the Destin Commons in Florida. My husband and I are her for the Ironman Triathlon he is participating in. I'm working, but took a break to discuss the following ... One lady has a Verizon wireless USB card. She says she has used 802.539 Mb of her 5Gb allocated to her plan. She wants to know how many MB are in 1 Gb. She's worried that she's almost there. As I can remember the following is true, but there is quite an argument here so maybe I'm wrong?

1024 bytes is equal to 1Kb

1024 Kb is equal to 1 Mb

1024 Mb is equal to 1 Gb

Right?

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