Experiment 3-6 Calculating personal income tax (10 points)

Assume personal income 税率×(工资−1600)tax: . Please write a program to calculate the income tax payable, where the tax rate is defined as:

• When the salary does not exceed 1600, the tax rate is 0;
• When the salary is in the range (1600, 2500], the tax rate is 5%;
• When the salary is in the range (2500, 3500], the tax rate is 10%;
• When the salary is in the range (3500, 4500], the tax rate is 15%;
• When the salary exceeds 4500, the tax rate is 20%.

Input format:

Enter a non-negative salary in one line.

Output format:

Output personal income tax on one line, accurate to 2 decimal places.

Input example 1:

1600

Output example 1:

0.00

Input example 2:

1601

Output example 2:

0.05

Input example 3:

3000

Output sample 3:

140.00

Input example 4:

4000

Output sample 4:

360.00

Input example 5:

5000

Output sample 5:

680.00

Code:

# include <stdio.h>
# include <stdlib.h>

int main() {
    
    
    double salary,pay;
    scanf("%lf",&salary);
    if (salary <= 1600) pay = 0;
    else if (salary <= 2500) {
    
    
        pay = (salary - 1600) * 0.05;
    }else if (salary <= 3500) {
    
    
        pay = (salary - 1600) * 0.1;
    }else if (salary <= 4500) {
    
    
        pay = (salary - 1600) * 0.15;
    }else {
    
    
        pay = (salary - 1600) * 0.2;
    }
    printf("%.2lf",pay);
    return 0;
}

Submit screenshot:

Problem-solving ideas:

It’s just the task of the master (application of the piecewise function~). In fact, this setting is quite unreasonable. I think that each file should be paid according to the tax rate of that file. For example: I have a monthly salary of 4,500 yuan, then I need to pay The cost is:
0 + (2500 - 1600) * 0.05 + (3500 - 2500) * 0.1 + (4500 - 3500) * 0.15 = 295.0