> For the complete documentation index, see [llms.txt](https://docs.gooddollar.org/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.gooddollar.org/previous-protocol-versions/protocol-v3/core-contracts-and-api/contributioncalculation.md).

# ContributionCalculation

### Events

#### SellContributionRatioUpdated

Emits when the contribution ratio is updated.

<table><thead><tr><th width="320.9082692632695">Parameter name</th><th>Annotation</th></tr></thead><tbody><tr><td>caller</td><td>The address of the Avatar.</td></tr><tr><td>nom</td><td>The nominator of the ratio.</td></tr><tr><td>denom</td><td>The denominator of the ratio.</td></tr></tbody></table>

```
event SellContributionRatioUpdated(
    address indexed caller, 
    uint256 nom, 
    uint256 denom
);
```

### calculateContribution

Calculate the amount after contribution during the sell action. There is a `sellContributionRatio` percent contribution.

| Parameter name | Annotation                              |
| -------------- | --------------------------------------- |
| \_marketMaker  | The market maker address.               |
| \_reserve      | The reserve address.                    |
| \_contributer  | The contributer address.                |
| \_token        | The token to convert from.              |
| \_gdAmount     | The total G$ amount to contribute from. |

Returns: the contribution amount for sell.

```
function calculateContribution(
   GoodMarketMaker _marketMaker,
   GoodReserveCDai _reserve,
   address _contributer,
   ERC20 _token,
   uint256 _gdAmount
) external view returns (uint256);
```


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