A man sold 20 articles for $40 and gained 20%. How many articles should he sell for $90 to incur a loss 20%?
Pick:
A) 45
B) 36
C) 40
D) 50
E) 67.5
Production cost per article: $40*(100%-20%) / 20 = $1.6   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 / $1.6 = 67.5   Thus, solution 67.5 is correct.108 /  1.6= 
<gadget id="calculator">108 /  1.6</gadget>
<output>67.5</output>
67.5   Thus, solution 67.5 is correct.
<result>E</result>
A man sold 20 articles for $40 and gained 20%. How many articles should he sell for $90 to incur a loss 20%?