Finding amount of discount

How do I solve this:
 $49.99 shoes, at 33 1/3% off what is the discount?

Finding 33 1/3% is the same as dividing by 3, 
because 1/3 is .3333.... which is 33.3333.....% which is 33 1/3% {1/3 is .3 repeating}

$49.99 ÷ 3
= $16.6633333.......{divided 49.99 by 3}
$16.66 is the amount of discount

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