calculateAPYLpTokenPrice.js

const calculateLpTokenPrice = async () => {
  let rewardTokenPrice = 0;
  // For Price IN ETH
  // Reward Token is Dodgecoin in our case
  rewardTokenPrice = await getDogecoinPriceInETH();

  // For Price in BNB
  // If you want to do calculations in BNB uncomment line below and comment line number 5
  // rewardTokenPrice = await getDodgecoinPriceInBNB()

  // 1 * rewardTokenPrice because 1 is the price of ETH or BNB in respective mainnet
  // This is square root of (p0 * p1) with reference to the image above
  const tokenPriceCumulative = new BigNumber(1 * rewardTokenPrice).sqrt();

  // For ETH / DOGE pair totalReserve[0] = ETH in the contract and totalReserve[1] = DOGE in the contract
  // For BNB / DOGE pair totalReserve[0] = BNB in the contract and totalReserve[1] = DOGE in the contract
  const totalReserve = await getLpTokenReserves();

  // This is square root of (r0 * r1) with reference to the image above
  const tokenReserveCumulative = new BigNumber(totalReserve[0])
    .times(totalReserve[1])
    .sqrt();

  // Total Supply of LP Tokens in the Market
  const totalSupply = await getLpTokenTotalSupply();

  // Calculate LP Token Price in accordance to the image above
  const lpTokenPrice = tokenReserveCumulative
    .times(tokenPriceCumulative)
    .times(2)
    .div(totalSupply);

  // If lpTokenPrice is a valid number return lpTokenPrice or return 0
  return lpTokenPrice.isNaN() || !lpTokenPrice.isFinite()
    ? 0
    : lpTokenPrice.toNumber();
};