If the productivity of a brigade grows by 30% 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?	Options:	A) 0.21	B) 0.82	C) 1.2	D) 1.21	E) 1.41
B = 10-men brigade   p = increase in the productivity = 30%   Solution: B x p = B x 1.3 = 1.3B -------&gt; the productivity of 11 men brigade   1.13B x p = 1.13B x 1.1 = 1.41B -----&gt; the productivity of 12 men brigade   The ratio of the productivity of a 12-men brigade to that of a 10-men brigade = 1.41B/B = 1.41   1.41
<result>E</result>
If the productivity of a brigade grows by 30% 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?