var BigDecimal = Java.type('java.math.BigDecimal');

function calculate(amount, percentage) {

    var result = new BigDecimal(amount).multiply(new BigDecimal(percentage)).divide(
        new BigDecimal("100"), 2, BigDecimal.ROUND_HALF_EVEN);

    return result.toPlainString();
}
var result = calculate(568000000000000000023,13.9);
print(result);