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tính phép tính

 Nhân dịp sinh nhật em gái, chị Hương mua tặng em mình ba món quà: 1 con gấu bông, 1 cái mũ và 1 chiếc khăn. Số tiền mua gấu bông và mũ hết 53000 đồng. Số tiền mua mũ và khăn hết 42000 đồng. Số tiền mua khăn và gấu bông hết 59000 đồng. Đố em biết con gấu bông có giá bao nhiêu đồng?

Một cửa hàng sau khi bán hết số hàng mua về tính ra tiền bán hàng bằng 125% tiền vốn. Như vậy tiền lãi chiếm số phần trăm so với tiền vốn.