c - プログラムを実行しようとするとクラッシュし続けるのはなぜですか?

Question

I am a beginner programmer (about a week) and my simple program keeps crashing. What did I do wrong? It crashes before I even input the amount of hours. Please help.

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

int hours;
float wage;
float total[2];

int main()

{

    printf("How many hours have you worked this week?\n");
    fgets(hours, sizeof(hours), stdin);
    sscanf(hours,"%d", &wage);

    if (hours < 40)
        wage = 8.5;
        total[0] = hours * wage;

    printf("You will earn %d dollars", total[0]);

    if (hours >= 40)
        wage = 12.75;
        total[1] = hours * wage;

    printf("You will earn %d dollars", total[1]);

    return 0;
}