A shirt goes on sale for 90% of its original price. One week later, the sale price is marked down 10%. The final price is what percent of the original price?	Choose the correct answer.
A) 72%  B) 81%  C) 52%  D) 50%  E) 28%
Just assume original price is 100.   Sale price = 90   Then it is marked down by 10% = 90-9= 
<gadget id="calculator">90-9</gadget>
<output>81</output>
81.   Hence it is 81% od the original price. Hence answer is 81%.
<result>B</result>
A shirt goes on sale for 90% of its original price. One week later, the sale price is marked down 10%. The final price is what percent of the original price?