A government begins the year with $6 trillion of public debt. During the year, it collects taxes of $4 trillion and spends $7 trillion on transfers and government purchases of goods and services. The public debt at the end of the year would be:

You are considering the purchase of one of two machines used in your manufacturing plant. machine 1 has a life of two years, costs $20,000 initially, and then $4,000 per year in maintenance costs. machine 2 costs $25,000 initially, has a life of three years, and requires $3,500 in annual maintenance costs. either machine must be replaced at the end of its life with an equivalent machine. using eac which is the better machine for the firm