In the first half of the 20th century, the population of a particular country increased by 200 percent. In the second half of the century, the population increased by 300 percent. What was the percent increase for the 20th century as a whole?	Choose the correct choice from the following choices
A) 500% B) 600% C) 800% D) 1100% E) 1200%
Say initially population was 100.   What is 200% of 100? It is   200/100 * 100= 
<gadget id="calculator">  200/100 * 100</gadget>
<output>200</output>
200.   An increase of 200% means the new population became  100 + 200= 
<gadget id="calculator"> 100 + 200</gadget>
<output>300</output>
300   What is 300% of 300? It is   300/100 * 300= 
<gadget id="calculator">  300/100 * 300</gadget>
<output>900</output>
900   An increase of 300% means the new population now is  300 + 900= 
<gadget id="calculator"> 300 + 900</gadget>
<output>1_200</output>
1200   So from 100, the population increased to 1200 i.e. an increase of 1100.   1100 is what percent of 100?   1100= x/100 * 100   i.e. it is 1100% 1100%
<result>D</result>
In the first half of the 20th century, the population of a particular country increased by 200 percent. In the second half of the century, the population increased by 300 percent. What was the percent increase for the 20th century as a whole?