Step-by-step reasoning process: When the price of the book is decreased by 15%, the total price decrease is 15 / 100 * $400 = $60. The new price of the book becomes $400 - $60 = $340. The price of the book is then increased by 40 / 100 * 340 = $136. The final price of the book is $340 + $136 = $476.
The question and answer:
Question and answer: The price of a book was $400. If the book's price is decreased by 15% and then increased by 40%, what is the final price of the book?
The answer is 476

Step-by-step reasoning process: The dolls will sell for 3 * $5 = $15. The clocks will bring in 2 * $15 = $30. The glasses will sell for 5 * $4 = $20. In total, she will bring in $15 + $30 + $20 = $65. Her total profit will be $65 - $40 = $25.
The question and answer:
Question and answer: Stella’s antique shop has 3 dolls, 2 clocks and 5 glasses for sale. She sells the dolls for $5 each. The clocks are priced at $15 each. The glasses are priced at $4 each. If she spent $40 to buy everything and she sells all of her merchandise, how much profit will she make?
The answer is 25

Step-by-step reasoning process: Mom bought things that cost: 4 + 4 + 2 + 6 + 11 = €27 . So she has 55 – 27 = €28 left.
The question and answer:
Question and answer:
Mom went shopping at the market. She left with €55. She bought 2 packs of bananas for €4 each, pears for €2, asparagus for €6 and finally a chicken for €11. How much money does Mom have left?
The answer is 28