C plus plus read cost, year and quantity cost for 10 items

main.cpp

#include<iostream>
using namespace std;
int main(){
        const int size = 10;
        double cost[size];
        int yearofmanufacture[size];
        int soldcount[size];
        int i;
        double total = 0;
        double price = 0;
        double rate = 0;
        cout << "Enter the cost for all " << size << " types of items, separated by a space" << endl;
        for(i = 0; size > i; i ++){
                cin >> cost[i];
        }
        cout << "Enter the year of manufacture for all " << size << " types of items, separated by a space" << endl;
        for(i = 0; size > i; i ++){
                cin >> yearofmanufacture[i];
        }
        cout << "Enter the number of items for all " << size << " types of items, separated by a space" << endl;
        for(i = 0; size > i; i ++){
                cin >> soldcount[i];
        }
        for(i = 0; size > i; i ++){
                rate = 0;
                if(1991 <= yearofmanufacture[i] && 2000 >= yearofmanufacture[i]){
                        rate = 40;
                } else if(2001 <= yearofmanufacture[i] && 2010 >= yearofmanufacture[i]){
                        rate = 20;
                } else if(2011 <= yearofmanufacture[i] && 2017 >= yearofmanufacture[i]){
                        rate = 10;
                }
                price = (cost[i] * soldcount[i]);
                price -= (rate/100);
                total += price;
        }
        cout << "The total revenue earned is: $" << total << endl;
        return 0;
}

Download code here.