A man sold 20 articles for $60 and gained 20%. 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%-20%) / 20 = $2.40   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 / $2.40 = 45   Thus, solution 45 is correct.108 /  2.40= 
<gadget id="calculator">108 /  2.40</gadget>
<output>45</output>
45   Thus, solution 45 is correct.
<result>A</result>
A man sold 20 articles for $60 and gained 20%. How many articles should he sell for $90 to incur a loss 20%?