Confused with R2 Pricing

Hi all. I was planning to use R2 for a small project. I saw the pricing. But I was confused. My question is :

The free tier 10G/month is it free to use 10GB/month like I used it full 10GB and next month again I used it 10GB. The total size will be of 20GB. So will I be paying or I will be in free tier ?
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