C.P. of 21 article = S.P of 18 articles. Let, C.P of 21 articles=x CP of 1 article = x 21 SP of 18 articles=x SP of 1 article = x 18 since x / 21 < x / 18, ⇒ there is a gain ∵ gain = S P − C P = x / 18 − x / 21 = (7 x − 6 x) / 126 = x / 126 gain%= g a i n C P × 100 = (x / 126 ÷ x / 21) × 100 =(x/126×21/x)×100 = 100 / 6 = 50 / 3.

Paint is applied on iron articles for several reasons, including: Protection from corrosion Aesthetics Identification and labeling Insulation Reflectivity Making it resistant to fire It is also important to use appropriate paint for iron articles.

Science News features daily news articles, feature stories, reviews and more in all disciplines of science, as well as Science News magazine archives back to 1924.

It was passed by the Parliament in August 2009. When the Act came into force in 2010, India became one among 135 countries where education is a fundamental right of every child. The 86th Constitutional Amendment (2002) inserted Article 21A in the Indian Constitution which states: