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6. (1 mark) Gismondi is infected with a new virus whose population (in his body) grows according to the exponential growth model A(t) = Apekt. After three hours, 20 mg of virus in his body. After four hours, 20e mg of virus is in his body. The growth rate k in hour- is given by: a) te b) } c ) d) - } e) 1 O a Ob