โปรแกรมซื้อรถจักรยานยนต์ด้วยเงินผ่อน ภาษาซี (Buy motorcycles with installment in c code)

#include <stdio.h>
#include <conio.h>
int main()
{
   float a,b,c,n,m,x,y,z,t,t1;
   
   printf("Enter Price of motorcycle: ");
   scanf("%f",&n);
   printf("Enter Amount of down payment: ");
   scanf("%f",&m);
   printf("Enter Period: ");
   scanf("%f",&t);
   
   x = n - m;
   a = n*20/100;
   b = x/12;
   t1 = t*12;
   y = x*4.3/100*t1;
   z = y + n;
   c = n + y;
   
   if(m >= a && t == 1 || t == 2 || t == 3 || t == 4){
   printf("\n\nCalculate results of installment motorcycle: ");
   printf("\n\nPrice of motorcycle = %f Bath",n);
   printf("\n\nDown payment = %f Bath",m);
   printf("\n\nInterest = %f percent/year",4.3);
   printf("\n\nPeriod = %f month",t1);
   printf("\n\nHave to pay about = %f Baht/month",b);
   printf("\n\nAll interest = %f Bath",y);
   printf("\n\nSummary of all payments (car price + interest) is %f",c);
   }
   getch();
}