[tex]\bf \boxed{53} \\\\\\ 1980\stackrel{\textit{13 units = t}}{\rule[0.35em]{10em}{0.25pt}}1993 \\\\\\ P=15.5[(13)+62]\implies P=15.5(75)\implies P=1162.5\implies \stackrel{\textit{rounded down}}{P = 1162} \\\\[-0.35em] ~\dotfill\\\\ \boxed{54} \\\\\\ \textit{in 1980 t = 0}\qquad \qquad P=15.5[(0)+62]\implies P=15.5(62)\implies P=961 \\\\\\ \stackrel{\textit{increase in the population}}{1162-961\implies 201}[/tex]
on 53) the 1162 is rounded or truncated down to 1162, because this is a population so each number is a person, so there are no 0.5 persons, unless you saw one off, and we wouldn't do that :).
