Almost all items that we acquire, depreciate in value over several years of usag

Question

Almost all items that we acquire, depreciate in value over several years of usage. The yearly depreciation in value D for an item is often computed using the formula: D = (P - S) / Y where P is the purchase price in S, S is the salvage value in $, and Y is the number of years the item is used. Write a Java program, named C248W2011A1_Q2, which prompts the user to enter the values for all three values in the same order (i.e. P, S, and Y) as a single input separated by spaces between them. The program then computes the yearly depreciation in S, and yearly percentage depreciation, and number of years the value gets depreciated to 10% of purchase price of the item. Your program must print the results in two decimal digits rounded using the Math.round() function. Sample output screen: Welcome to the Depreciation calculator Enter the values (Price, Savage value, and Years used) with spaces between them: 300 25 5 Yearly depreciation = $55 0 Yearly depreciation % = 18.33% Number years for salvage value to become 10% of purchase price = 4.91 years

Explanation / Answer

import java.util.*;

public class C248W2011A1_Q2
{
public static void main(String[] args)
{
System.out.println("Welcome to the Depreciation calculator ");

// input
Scanner kb = new Scanner(System.in);
System.out.print("Enter the values (Price, Salvage value, and Years used) with spaces between them: ");

double price = kb.nextDouble();
double salvage = kb.nextDouble();
double years = kb.nextDouble();

// calculations
double depreciation = (price - salvage)/years; // D = (P-S)/Y
double percent = depreciation/price*100;
// compute number of years for salvage value to become 10% of purchase price.
// S = 10% * P
// D = (P - 0.1P)/Y
// Y = (P - 0.1P)/D
double tenpercent = (price - 0.1*price)/depreciation;

// output
// Math.round() can round, but so can printf(). Much easier.
// if you want to use Math.round(), multiply by 100, round(), then divide by 100
// you'll have rounded to 2 decimal places
System.out.printf("Yearly depreciation = $%.2f ", depreciation);
System.out.println("Yearly depreciation % = "+String.format("%.2f", percent)+"%");
System.out.println("Number of years for salvage value to become 10% of purchase price: "+String.format("%.2f", tenpercent)+" years ");
}

}

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