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docs: freshen and clarify rent-exempt dev description (#16562)

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(cherry picked from commit 76ce28c723)

Co-authored-by: Trent Nelson <trent@solana.com>
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mergify[bot]
2021-04-15 04:35:08 +00:00
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docs/src/developing/programming-model/accounts.md
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@ -206,3 +206,16 @@ balance of 105,290,880 lamports (=~ 0.105 SOL) to be rent-exempt:
```text
105,290,880 = 19.055441478439427 (fee rate) * (128 + 15_000)(account size including metadata) * ((365.25/2) * 2)(epochs in 2 years)
```
Rent can also be estimated via the [`solana rent` CLI subcommand](cli/usage.md#solana-rent)
```text
$ solana rent 15000
Rent per byte-year: 0.00000348 SOL
Rent per epoch: 0.000288276 SOL
Rent-exempt minimum: 0.10529088 SOL
```
Note: Rest assured that, should the storage rent rate need to be increased at some
point in the future, steps will be taken to ensure that accounts that are rent-exempt
before the increase will remain rent-exempt afterwards