In the following figure, rectangle represents Mechanics, circle represents Illustrators, triangle represents Singers and square represents Mothers. Which set of letters represents Illustrators who are not singers ?
X and Y undertook to do a piece of work for Rs 5400. X alone could do this work in 18 days and Y alone could do this work in 24 days. With the assistance of Z they finished the work in 8 days. What is the share (in Rs) of Z?