A man sold 20 articles for $60 and gained 20%. How many articles should he sell for $90 to incur a loss 10%? Choose the correct choice from the following options:  A) 45  B) 41.2  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% + 10%) = $99   Number of articles to be sold for $108 to incur a 20% loss: $99 / $2.40 = 41.2   Thus, solution 41.2 is correct.
<result>B</result>
A man sold 20 articles for $60 and gained 20%. How many articles should he sell for $90 to incur a loss 10%?