When ever you combine different elements the chemical properties change because elements are different , unless you combine the exact same elements.
The answer would be 747.50! Because if you were wanting to decrease the price then you would multiply $299 by 40% So since you are wanting to add to the price then you would divide...Hope that makes since :)
Take a better pic and i will explain in comment
Answer:
see the file hope it's helpful to you
Answer
10^5
Because you add exponents if multiplying and 8+-3 is 5
