DFX Finance Rounding Error Bugfix Review 7.sol

// takes a numeraire amount, calculates the raw amount of eurs, transfers it in and returns the corresponding raw amount
function intakeNumeraire(int128 _amount)
    external
    override
    returns (uint256 amount_)
{
    uint256 _rate = getRate();

    amount_ = (_amount.mulu(10**tokenDecimals) * 10**oracleDecimals) / _rate;

    require(amount_ > 0, "intakeNumeraire/zero-amount!");
    token.safeTransferFrom(msg.sender, address(this), amount_);
}