Please choose the correct solution to the question: How can you rapidly calculate a 20 percent tip?

Solution1: Take the total of the bill and move the decimal point one place to the left, double that number and that is 20 percent.

Solution2: Take the total of the bill and move the decimal point one place to the right, double that number and that is 20 percent.

Answer format: solution1/solution2
Answer: solution1