残高分割払いを計算するCプログラムを作成する

問題

Cプログラムを作成して、特定のローン金額（利息付き）に対して毎月支払われる分割払いの残高を計算します。

解決策

以下は、融資額が与えられたときに利息を計算する式です-

i=loanamt * ((interest/100)/12);

次の計算により、利息付きの金額が得られます-

i=i+loanamt;
firstmon=i-monthlypayment; //first month payment with interest
i=firstmon * ((interest/100)/12);

プログラム

#include<stdio.h>
int main(){
   float loanamt,interest,monthlypayment;
   float i,firstmon,secondmon;
   printf("enter the loan amount:");
   scanf("%f",&loanamt);
   printf("interest rate:");
   scanf("%f",&interest);
   printf("monthly payment:");
   scanf("%f",&monthlypayment);
   //interest calculation//
   i=loanamt * ((interest/100)/12);
   //amount with interest
   i=i+loanamt;
   firstmon=i-monthlypayment; //first month payment with interest
   i=firstmon * ((interest/100)/12);
   i=i+firstmon;
   secondmon=i-monthlypayment; //second month payment with interest
   printf("remaining amount need to pay after 1st installment:%.2f\n",firstmon);
   printf("remaining amount need to pay after 2nd installment:%.2f\n",secondmon);
   return 0;
}

出力

enter the loan amount:45000
interest rate:7
monthly payment:1000
remaining amount need to pay after 1st installment:44262.50
remaining amount need to pay after 2nd installment:43520.70