6 reduced by 33 1/3%

Question

the original price of a book was 6$.it was reduced by 33 1/3% the books price was later increased back to6$

Answer 1

6 -(6/3)=6-2=4

............

Answer 2

33 1/3% of 6 is 2

this means that the $6 book was reduced by $2.

$6-2=$4