Dena is trying to solve this problem: A store has a sale where every item has a sale price that is 20% less than the regular price. Write an expression that represents the sale price of an item if the
regular price is p dollars.
Dena said, "To find 20% of a number, I should multiply by 0.20. So the sale price of an item will be 0.20p."
Which statement best describes Dena's reasoning?
A Dena is correct.
Dena needs to subtract 0.20p from the regular price, p.
Dena should calculate the sale price as 20p and then divide by 100.
Dena is trying to solve an impossible problem because it doesn't say what the regular price is.