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7. A nature reserve has a population of 20 leopards in 2010. The number of leopards in t the nature reserve can be modelled by the formula L = Loe where L is the number of leopards in the population, L0 is the initial population size and r is the time in years. (a) How many leopards does the model predict the nature reserve will have after 10 years? The reserve has enough space for 60 leopards. (b) How long will it be until the reserve runs out of space