Exercise 2: Which Price Actually Gets Charged — Possible Solution
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THE ANSWER: THE NEW, HIGHER 2PM PRICE
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Per this chapter, the customer pays the price in effect at the moment
checkout is actually submitted (3pm) - the raised price - not the
price that was in effect when the item was originally added to the
cart (1pm).

WHY: CHECKOUT RE-VALIDATES AGAINST LIVE, CURRENT VALUES
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Per this chapter, when checkout is submitted, WooCommerce re-validates
the cart by checking each item's current stock and price against what
is actually configured right now, not what was cached when the item
was added. The chapter states this explicitly: "a product's price or
stock level can change between 'added to cart' and 'checkout
submitted' - WooCommerce always uses the live, current value at the
moment of checkout."

WHY THIS WORKS AS AN ANSWER
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It correctly identifies the 3pm (post-change) price as the one
actually charged, and correctly grounds that answer in this chapter's
own explicit statement that checkout always re-validates against
current live pricing rather than whatever price was displayed when
the item was first added to the cart.