#include <stdio.h>
#include <math.h>
int main(){
double money,year,rate,interest;
if (scanf("%lf %lf %lf",&money,&year,&rate)!=EOF){
// printf("%f %f %f",money,year,rate);
interest = money*pow((1+rate),year)-money;
printf("interest = %.2f",interest);
}else{
printf("input wrong");
}
return 0;
}
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