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//t the user for the required inputs var costOfProbe = parseFloat(prompt("Enter the cost of the probe:")); var costSavingsPerHour = parseFloat(prompt("Enter the cost savings per hour:")); var hoursSavedPerWeek = parseFloat(prompt("Enter the number of hours saved per week:")); var weeksPerYear = parseFloat(prompt("Enter the number of weeks the machine is in use per year:")); // Calculate the ROI var annualCostSavings = costSavingsPerHour * hoursSavedPerWeek * weeksPerYear; var roi = (annualCostSavings / costOfProbe) * 100; // Display the results document.write("By using a probe, you can save $" + annualCostSavings + " per year."); document.write("Your ROI for purchasing the probe is " + roi + "%.");