Well Those are variables and it is using the Distributive property to solve. For example P(a+b) simplify P*a + P*b.
Answer:
it should be 4.24264068712 looked it up
$57.18 + 256.79 = 313.97
313.97 - 68.42 = 245.55
245.55 - 50.00 = 195.55
195.55 - 31.06 = 164.49
that’s your answer
It would be much easier if you attached a table. Anyway I know what you need to do. Just make an equation and put the numbers from the table given you in the task. And you'll solve it.