(a) CP. of articles 100 (let)Marked price of articles=100100×130​=130S.P. of half of articles=2130​565S.P of one-fourth of articles at 15%=265​×10070​== Rs. 27.625S.P of remaining articles=265​×10070​=Rs. 22.75Total S.P.(65 + 27.625 + 22.75)115.375Profit % = 15.375%= 1583​ %