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두산(이) 9과본문인데 여기 주제문을 찾아주세요~

how much jajangmyeon can you buy with 60 won?
maybe a few noodles?
well, in 1970, you could buy a bowl of jajangmyeon for 60 won.
today, you need about 4,500 won. like everything, the price of jajangmyeon has gone up over the years.
in ten years, how much will it cost?
no one knows for sure.
as time goes by, prices rise.
rising prices means that you need to prepare for the future.
how can you do this?
many people think that making a lot of money is the best way.
but saving a lot of money is as important as making a lot of money.
you can do this by keeping a money diary.
you can write down how much money comes in and goes out.
any time money comes in, use a black pen and any time money goes out, use a red pen.
by doing this, you can set up a plan to save money.

*윗글의 주제문으로 가장 적절한것은?
1.you can save money by keeping a money diary.
2.both saving money and making money are importent.
3.rising prices never help us.
4.making money is the best way to prepare out future.