In the textbook, there is a problem that you guys answered.

In this problem, Aeroton Electronics is purchasing a water filtration system worth $40,000. The estimated life of filtration system is 7 years with salvage value of $7,500. If Electronics purchase filtration system....

In part 5/7

When finding PW, we have =$20,000 + $10,000 * (P/A, 10%,7) - ....

next part is

$10,000 * 4.8684 - ...

A, 10%, 7?

How do you find P/A?

How do you find P/F?

Could you provide step by step instructions entirely written out for how you got 4.8684 and all the other decimals?