Do you accept my challenge ?

Question

Calculator.sum(String... numbers) return the sum of numbers (table of numbers)
numbers contain always numbers of float as String
This implementation return sometimes a false result, for example Calculator.sum("59.25", "2.30") return 61.54999999
Change the method sum to return always the right sum

import java.math.*;
class Calculator {
static String sum(String... numbers) {
double total = 0;
for (String number : numbers) {
total = total + number;
}
}
}

Answer 1

convert 'number' to a double before adding it to the total.
Then return total as a string. (Or change the rethrn type of the method to a double and just return total).