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Practice asking questions in math class in Grade Two.
If you say "Mr. Zhang wants to keep the same income in 2002 as in 200 1 year", you will determine the income, not the rate of return.

The original principal was 6,543,800 yuan, and 50,000 yuan was taken out, so there is still 50,000 principal.

After two years, it will eventually reach 66,000, so the income for two years is 1.6 million, and the annual income is 0.8 million ~

Then the rate of return, the principal of 0 1 year is 50,000 +0.8 million = 58,000, and the income is 0.8 million ~

The yield is 0.8/5.8.