A certain company comes out with a new product and the number of investors in the company grows exponentially at a rate of $10 \%$ per week. After three weeks, there are 1,290 investors in the company. How many investors were there before the three weeks?

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The Answer of A certain company comes out with a new product and the number of investors in the company grows exponentially at a rate of $10 \%$ per week. After three weeks, there are 1,290 investors in the company. How many investors were there before the three weeks?

A Certain Company Comes Out with a New Product and the Number