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#include"stdio.h"
#include"math.h"
void main(void)
{
int gvelocity;
int dvelocity;
int year,total;
clrscr();
printf("total population of this year.\n");
scanf("%d",&total);
printf("per year grow velocity.\n");
scanf("%d",&gvelocity);
printf("per year die velocity.\n");
scanf("%d",&dvelocity);
printf("the result is after year.\n");
scanf("%d",&year);
total=total*pow((1+gvelocity-dvelocity),year);
printf("%d",total);
getch();
}