Please choose the correct solution to the question: How can I set aside 500 dollars, a bit at a time?

Solution1: Place spare twenties in a 2 liter bottle, the volume of 2 liters equal 500 dollars in twenties.

Solution2: Place spare dimes in a 2 liter bottle, the volume of 2 liters equal 500 dollars in dimes.

Answer format: solution1/solution2
Answer: solution2