The entrance fee for a fair is $5 for persons under the age of 18, and 20% more for persons older. Each ride at the fair costs $0.50. If Joe goes with her 6 years old twin brothers, and they each took 3 rides in total. How much money does Joe end up spending at the fair?
Choose the correct choice:
A) 16 B) 20.5 C) 17.5 D) 20 E) 4.5
Total entrance fee is (2*$5) + (1.20*5)= $16   Total rides fee is (0.50*3)*3(2* 5) + (1.20*5)= 
<gadget id="calculator">(2* 5) + (1.20*5)</gadget>
<output>16</output>
$16   Total rides fee is  (0.50*3)*3= 
<gadget id="calculator"> (0.50*3)*3</gadget>
<output>4.5</output>
$4.50   Total money spent is $20.50   Answer is 20.5
<result>B</result>
The entrance fee for a fair is $5 for persons under the age of 18, and 20% more for persons older. Each ride at the fair costs $0.50. If Joe goes with her 6 years old twin brothers, and they each took 3 rides in total. How much money does Joe end up spending at the fair?