class Solution {
    public double calculateTax(int[][] brackets, int income) {
        int prev = 0;
        double tax = 0d;
        for(int[] b : brackets){ 
            int d = b[0] - prev;
            if(d <= income)
                tax += ((double)b[1] / 100d) * d;
            else
                tax += ((double)b[1] / 100d) * (double)income;
            income -= d;
            if(income <= 0)
                break;
            prev = b[0];
        }
        return tax;
    }
}