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#include <stdio.h>
int main(void) {
int salary;
double tag;
scanf("%d",&salary);
if (salary<=1600) {tag=0.0;
} else if (1600<salary && salary<=2500) {tag=(salary-1600)*0.05;
} else if (2500<salary && salary<=3500) {tag=(salary-1600)*0.1 ;
} else if (3500<salary && salary<=4500) {tag=(salary-1600)*0.15;
} else if (4500<salary ) {tag=(salary-1600)*0.2 ;
}
printf("%.2lf",tag);
return 0;
}
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