Tax calculator

Of course! I can help you with that. Here's a C function that calculates the output based on the provided table:

```c
#include <stdio.h>

double calculateOutput(double input) {
    double output;
    if (input < 1) {
        output = input * 0.1;
    } else if (input >= 1 && input <= 5) {
        output = input * 0.2 - 0.1;
    } else if (input > 5 && input <= 10) {
        output = input * 0.3 - 0.6;
    } else if (input > 10 && input <= 30) {
        output = input * 0.4 - 1.6;
    } else {
        output = input * 0.5 - 4.6;
    }
    return output;
}

int main() {
    double input = 15;
    double output = calculateOutput(input);
    printf("Input: %.1f\nOutput: %.1f\n", input, output);
    return 0;
}
```

In the above code, the `calculateOutput` function takes an input value and applies the logic based on the provided table to calculate the output. The `main` function tests the `calculateOutput` function with an input of 15 and prints the input and output values. You can modify the `input` value in the `main` function to test with different values.