Assume your company has $100K in its cash account. According to the most recent economic forecasts, your best investment opportunity in the market will be returning 8% in the coming five years and 5% thereafter. You can invest $100K on overhauling the production method which will leave the sales per year the same but is projected to improve the profit margin from 10% to 12%, what should be your "sales per year" for overhauling to be the preferred alternative?