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(a) The population of Boomtown is currently 12000 and expected to grow by 3.5%
over the next year. What will its population be by then?
(b) The population of Dullsville, on the other hand, is currently 10000 and expected
to decrease by 5% over the next year. What will its population be by then?
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(a) 12000*(1+0.035) = 12000*1.035 = 12420. ANSWER
(b) 10000*(1-0.05) = 10000*0.95 = 9500. ANSWER
Solved, with explanations.