In cost benefit analysis why must there be a single common unit?

Asavings account that pays interest every 3 months is said to have a interest period

Suppose an economy has only two sectors: goods and services. each year, goods sells 80% of its outputs to services and keeps the rest, while services sells 62% of its output to goods and retains the rest. find equilibrium prices for the annual outputs of the goods and services sectors that make each sector's income match its expenditures.

Sailcloth & more currently produces boat sails and is considering expanding its operations to include awnings for homes and travel trailers. the company owns land beside its current manufacturing facility that could be used for the expansion. the company bought this land 5 years ago at a cost of $319,000. at the time of purchase, the company paid $24,000 to level out the land so it would be suitable for future use. today, the land is valued at $295,000. the company has some unused equipment that it currently owns valued at $38,000. this equipment could be used for producing awnings if $12,000 is spent for equipment modifications. other equipment costing $490,000 will also be required. what is the amount of the initial cash flow for this expansion project?