Entry fee in a zoo is $10. Later this was reduced by 50% which increased the sale by 40%. The percentage increase in the number of visitors is?
Choose the most appropriate option:  A) 100%  B) 50%  C) 180%  D) 200%  E) 150%
Let the total original sale be $1000   Then original number of visitors = 100   New number of visitors = 1400/5= 
<gadget id="calculator">1400/5</gadget>
<output>280</output>
280   Increase %= 180%   Answer is 180%
<result>C</result>
Entry fee in a zoo is $10. Later this was reduced by 50% which increased the sale by 40%. The percentage increase in the number of visitors is?