code: @Override
      public MonetaryAmount apply(MonetaryAmount amount){
          Objects.requireNonNull(amount, "Amount required.");
          NumberValue num = amount.getNumber();
          BigDecimal one = new BigDecimal("1.0").setScale(num.getScale() < 5 ? 5 : num.getScale(),
                  BigDecimal.ROUND_HALF_EVEN);
          return amount.getFactory().setNumber(one.divide(num.numberValue(BigDecimal.class), RoundingMode.HALF_EVEN))
                  .create();
      }
docs: Gets the amount as reciprocal / multiplicative inversed value (1/n).
  
  E.g. 'EUR 2.0' will be converted to 'EUR 0.5'.
  
  @return the reciprocal / multiplicative inversed of the amount
  @throws ArithmeticException if the arithmetic operation failed