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Is there the last question in the math volume of the third grade students of Xueba Association?
1 If the sales volume is X when no gifts are given, the profit is 20x.

It is known that f (1) = (20-1) (1+10%) x.

f(2)=(20-2)( 1+ 10%)^2x

……

f(n)=(20-n)( 1+ 10%)^nx

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