In order to reduce weight healthily, weight will be reduced by 4% every month.

Please calculate how many months it will take by achieving the target weight.

eg. My weight now is 54.3 kg, and I want to lose weight to 46.5 kg. It will take 4 months;

input : before=54.3,after=46.5 >>> output : month = 4

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George Berken Riccardo G. Bin Jiang Lorenzo

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