Your company is considering buying one of the two machines into product line. These two machines have different initial costs, annual operating costs, and different length of lives as following.

Machine A: Initial costs of $$350,000$; annual costs of $$20,000$ for $5$ years

Machine B: Initial costs of $$450,000$; annual costs of $$10,000$ for $8$ years

The cost of capital is $10\%.$ What are their equivalent annual costs $($EACs$)?$ If you want to have lower average annual cost, which machine should you choose?