这个用C语言怎么编写呀？真的不会啊！

#include "stdio.h"

void main()
{
float hour,money;
printf("input hour numbers:");
scanf("%f",&hour);
if(hour<=10&&hour>0)
{
money=30;
}
else if(hour>10&&hour<50)
{
money=(hour-10)3+30;
}
else if(hour>=50)
{
money=30+403+(hour-50)*2.5;
}
else
{
printf("it is error");
}
printf("money is %f\n",money);
}