A grocery dealer cheats to the extent of 10% while buying as well as selling by using false weight. What is his actual gain % in whole process?

A shopkeeper allows 18% discount on the marked price of an article and still makes a profit of 25%. If he gains ₹106.6 on the sale of the article, then what is the marked price of the article?

Three men do as much work as 4 boys do and the 4 boys can together complete work in 21 days. In how many days will 9 men and 2 boys complete the same work?

There are two verticals posts, one on each side of a road, just opposite to each other.One post is 108 metre high. From the top of this post, the angles of depression of the top and foot of the other post are 30*°* and 60*°* respectively. The height of the other post, in metre is:

A can do a work in \( 7 \frac{1}{2} \) hours and B can do the same work in \( 10 \frac{1}{2} \) hours. If they work together for \(3 \frac{1}{2}\) hours, then what part of the work will be left out?