RAM sold 48 articles for Rs. 2160 and suffered a loss of 10%. How many articles should be sold for Rs. 2240 to earn a profit of 12%?

36 40 44 50

40

SP of 1 article = \(\frac{2160}{48}\) = 45 loss of 10% = \(\frac{1→ loss}{10 → CP }\)                          9R → 45, then 10R → 50,  C.P. = Rs. 50 To gain 12%, S.P. = \(\frac{50 ×112}{100}\) = 56 No. of article = \(\frac{2240}{56}\) = 40