If the productivity of a brigade grows by 40% when the number of the workers in the brigade is increased by one, then which of the following is closest to the ratio of the productivity of a 12-person brigade to that of a 10-person brigade? Choose the correct answer:  A) 1.51  B) 0.82  C) 1.2  D) 1.21  E) 1.44
B = 10-men brigade   p = increase in the productivity = 40%   Solution: B x p = B x 1.4 = 1.4B -------&gt; the productivity of 11 men brigade   1.4B x p = 1.4B x 1.1 = 1.51B -----&gt; the productivity of 12 men brigade   The ratio of the productivity of a 12-men brigade to that of a 10-men brigade = 1.51B/B = 1.51   1.51
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If the productivity of a brigade grows by 40% when the number of the workers in the brigade is increased by one, then which of the following is closest to the ratio of the productivity of a 12-person brigade to that of a 10-person brigade?