#include <stdio.h>
int main() {
int unit,bill;
printf("enter number of unit used \n"); if(unit<=0){
printf("you don't have to pay anything"); }
else if (unit<=100){
bill= 5*unit;
printf("according to it you have to pay %d rupees",bill
); }
else if (unit<=200){
bill=(100*5+(unit-100)*7);
printf("you have to pay %d rupees",bill
); }
else if (unit<=300){
bill=((100*5)+(100*7)+(unit-200)*10);
printf("you have to pay %d rupees",bill
); }
else{
bill=((100*5)+(100*7)+(100*10)+(unit-300)*12);
printf("you have to pay %d rupees",bill
); }
return 0;
}
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