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public BigDecimal calculateFinalAmount(BigDecimal originalAmount, String fromCurrency, String toCurrency) { BigDecimal finalAmount; BigDecimal temporaryAmount; BigDecimal fromCurrencyExchangeRate = exchangeRateService.getCurrentExchangeRate(fromCurrency); temporaryAmount = originalAmount.multiply(fromCurrencyExchangeRate); BigDecimal toCurrencyExchangeRate = exchangeRateService.getCurrentExchangeRate(toCurrency); if (temporaryAmount.compareTo(toCurrencyExchangeRate) > 0) { finalAmount = temporaryAmount.divide(toCurrencyExchangeRate, 2, RoundingMode.HALF_UP); } else { finalAmount = temporaryAmount.multiply(toCurrencyExchangeRate); } return finalAmount; }