I can't pass this challenge, please help!

// TODO: These functions are in working order, but separately they don't match the single Function signature expected
Function<Integer, BigDecimal> usdToArgentinePesoConverter = usd -> argPesoToUsdRate.multiply(new BigDecimal(usd));

Function<BigDecimal, String> argentineCurrencyFormatter = price -> {
  Currency currentCurrency = Currency.getInstance(argLocale);
  NumberFormat currencyFormatter =
    NumberFormat.getCurrencyInstance(argLocale);
  return String.format("%s (%s)",
    currencyFormatter.format(price),
    currentCurrency.getDisplayName()
  );
};

Function<Integer, String> testConverter = usdToArgentinePesoConverter.andThen(argentineCurrencyFormatter);

return getConvertedPriceStatements(records, testConverter
  // TODO: Correct this.  It should to convert AND format.  However, there is room parameter wise for only one Function...hmmm.
  //homeValueIndex -> "FIXME!!!"
);