feature: show pools apr

app/javascript/src/utils/apr.ts

@@ -0,0 +1,22 @@
+import BigNumber from "bignumber.js";
+
+import { BLOCKS_PER_YEAR } from "../constants";
+
+export const getApr = (
+  stakingTokenPrice: number,
+  rewardTokenPrice: number,
+  totalStaked: number,
+  tokenPerBlock: number
+) => {
+  const totalRewardPricePerYear = new BigNumber(rewardTokenPrice)
+    .times(tokenPerBlock)
+    .times(BLOCKS_PER_YEAR);
+
+  const totalStakingTokenInPool = new BigNumber(stakingTokenPrice).times(
+    totalStaked
+  );
+
+  const apr = totalRewardPricePerYear.div(totalStakingTokenInPool).times(100);
+
+  return apr.isNaN() || !apr.isFinite() ? null : apr.toNumber();
+};