A can complete a certain job in 18 days. B is 80% more efficient than A. In how many days can B complete the same job?  Choose the correct choice from the following choices.
A) 6 B) 6.25 C) 7 D) 7.5 E) 10
Let, Total Work Unit = 180 Units   A can finish in 18 days = 180 unit work   i.e. A can finish in 1 days = 10 unit work   i.e. B can finish in 1 days = 10+(80/100)*10= 
<gadget id="calculator">10+(80/100)*10</gadget>
<output>18</output>
18 unit work   Days in which B will complete the work alone= 180/18= 
<gadget id="calculator">180/18</gadget>
<output>10</output>
10 days   Answer: Option 10
<result>E</result>
A can complete a certain job in 18 days. B is 80% more efficient than A. In how many days can B complete the same job?