A colony of bacteria in a petri dish grew by 150% from t0 to t1. The number of bacteria grew by 400% from t0 to t2. What was the percentage growth in the number of bacteria from t1 to t2?
Choices:  A) 500%  B) 167%  C) 200%  D) 250%  E) 100%
The bacteria grew by 150% for t0-t1, x+1.5x = 2.5x, and bacteria grew by 400% for t0-t2, x+4x = 5x. So, bacteria growth from t1-t2 = (5x-2.5x)/2.5x = 100%   Answer is 100%
<result>E</result>
A colony of bacteria in a petri dish grew by 150% from t0 to t1. The number of bacteria grew by 400% from t0 to t2. What was the percentage growth in the number of bacteria from t1 to t2?