calculateAmount(amount, symbol) {
    if (!(symbol in this.exchangePairs) || !this.exchangePairs[symbol].lot_size) {
      return undefined;
    }

    return OrderUtil.calculateNearestSize(amount, this.exchangePairs[symbol].lot_size);
  }
LTC: 0.65 => 1

@param amount
@param symbol
@returns {*}