Cost of a cubical shaped cake having one...

Cost of a cubical shaped cake having one side 10 centimeter is 20 rupees. Cost of another cube shaped cake having one side 20 centimeter is 120 rupees. Which is more profitable to buy? Why?

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Volume of the cubical shaped cake having one side 10 centimeter `=1000` cubic centimeter
Volume of the cubical shaped cake having one side 20 centimeter `=8000` cubic centimeter Volume of the secónd is 8 xx the volume of the first.
So, the cost of the second cake should be 8 xx `(20 xx 8=160)` the cost of the firstcake. But, the cost of the second càke is only 120 rupees. Só, the second.cake is more. profitable to buy:

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