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Ive figured out the solution for the differential equation to be, S = ce

^{kt}- D/k

If somebody invest 20,000 each year for the next 40 years with continuous compounded growth of 2%, the final value should be about 1,237,837.

I dont see how the equation S = ce

^{kt}- D/k works to 1,237,837.

I plug c = 20,000, k = .02, t = 40, and D = 20,000 and I get S = -955489

What am I doing wrong?