A man sold 20 articles for $60 and gained 10%. How many articles should he sell for $90 to incur a loss 20%?	Pick one
A) 45  B) 36  C) 40  D) 50  E) 48
Production cost per article: $60*(100%-10%) / 20 = $2.70   Required production costs for a loss of 20%: $90*(100% + 20%) = $108   Number of articles to be sold for $108 to incur a 20% loss: $108 / $2.70 = 40   Thus, solution 40 is correct.108 /  2.70= 
<gadget id="calculator">108 /  2.70</gadget>
<output>40</output>
40   Thus, solution 40 is correct.
<result>C</result>
A man sold 20 articles for $60 and gained 10%. How many articles should he sell for $90 to incur a loss 20%?