According to a survey conducted in two cities, A and B, 64% of the population is happy with the new president. If the ratio of the city A population to the city B population is 3:2 and the percentage of city A residents who are happy with the president is 70%, what percentage of city B population is happy with the president?
Choose the correct choice from the following options:
A) 30%  B) 50%  C) 25%  D) 55%  E) 62%
A/B = 3/2 = x suppose   that for A=3x   B=2x   Total A+B=5x   Now 64% is happy with new president, 64%*(5x) =3.2x is happy with new present out of total population of A &amp; B   now 70% of A is happy with new pres, so 70%*(3x) = 2.1x   Total happy people are 3.2x   so B=3.2x-2.1x=1.1x is happy   Now B's population is 2x   1.1x is 55% of total population of B   Answer : 55%3.2 -2.1= 
<gadget id="calculator">3.2 -2.1</gadget>
<output>1.1</output>
1.1x is happy   Now B's population is 2x   1.1x is 55% of total population of B   Answer : 55%
<result>D</result>
According to a survey conducted in two cities, A and B, 64% of the population is happy with the new president. If the ratio of the city A population to the city B population is 3:2 and the percentage of city A residents who are happy with the president is 70%, what percentage of city B population is happy with the president?