500 elves currently live in the great elf kingdom. The elves are very prolific, with a birth rate of 20% per year. The elves also live for a long time, so the death rate per year is only 5% of the population. in Addition, 55 new elves per year are coming into the kingdom due to a volcanic eruption in the not-so-great elf kingdom. Use a mass balance to determine the accumulation rate.
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