23 + (sum (sum (23+k*3)/(1+0.07)^k k from 1 to n-1)*(1-0.13)^(n-1)*0.13 n from 1 to inf)23 + (sum (sum (23+k*3)/(1+0.07)^k k from 1 to n-1)*(1-0.13)^(n-1)*0.13 n from 1 to inf)

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