William is trying to calculate the price of his groceries in his head. He has four apples for 35¢ each, five potatoes for 15¢ each, and three cake mixes for $2.25 each. He begins by thinking to himself, "Let's see, 4 times 35¢ is what? Two times 35¢ is 70¢, and then 2 times 70¢ is $1.40 . And then what do I do next? Oh, yes, I need to know what 5 times 15 equals. I can't remember, but let's
see if I can figure it out...." From the perspective of cognitive psychology, William may have trouble solving the problem because:
a. he is using an inappropriate heuristic.
b. he is encoding the problem incorrectly.
c. he is demonstrating a counterproductive mental set with regard to his use of multiplication facts.
d. his working memory capacity may be insufficient to hold and process all the information.
d
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