Give the step-by-step reasoning process and then the final answer. James earns $10 per week as an allowance. After saving all his money for four weeks, he spends half of it on a new video game. He then spends a quarter of what is left to buy a new book. How much money does he have left?
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He starts out with $10 * 4 = $40. James spend $40 / 2 = $20 on the video game. After buying the game, he has $40 - $20 = $20 left. He spent $20 / 4 = $5 on the book. He has $20 - $5 = $15 left.
The final answer: 15.
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