// 3.1.js
// 2016-02-13
// $Id: 3.1.js 1.2 2024/10/27 09:30:40 s Exp $

'use strict'

// input
const p = 25000;     // debt
const r = 0.07 / 12; // one-period interest rate
const n = 7 * 12;    // number of periods

// calculate monthly payments
const a = r * (1 + r) ** n * p / ((1 + r) ** n - 1); 

// output
console.log("input"); 
console.log("debt, p = ", p);
console.log("one-period interest rate, r = ", r.toPrecision(3)); 
console.log("number of periods, n = ", n);
console.log("output");
console.log("monthly payment is ", Math.round(a), "($)");
// end

// reference 
// David Flanagan著 『JavaScript 第7版』(オライリー・ジャパン) 2022-09-13.
// ** : p.80.
// console.log() : p.630.
// const : p.57.
// toPrecision() : p.51.
// use strict : p.134.