function calculateCur(string oraclizeResult) private view returns (uint256) {
    uint256 usdRaised = btcRaised.div(getUSDCentToBTCSatoshiRate())
      .add(ltcRaised.div(getUSDCentToLTCSatoshiRate()))
      .add(bnbRaised.mul(getBNBToUSDCentRate(oraclizeResult)))
      .add(bchRaised.mul(getBCHToUSDCentRate(oraclizeResult)));
    return usdRaised;
  }