Answer:
(w-2)x4 = p (i think)
Step-by-step explanation:
Suppose the original price to be x.
62%x=296.4
Divide both sides by 62% to get x=478, which is the original price.
When you have a negative exponent, you move it to the other side of the fraction to make the exponent positive.
For example:
or 
or y²
So:

Your answer is B
You can use photomath for this
16. 4 (9*4=36)
17. 6 (6*11=66)
18. 8 (10*8=80)
19. 9 (9*5=45)
20. 48 (4*12=48)
21. 13 (13*2=26)