Selling price of an article is $${7\over6}$$ of cost price. What is the profit percentage?

What will come in place of question mark ( ? ) in the following series?
13, 25, 61, 121, 205, ? 

Sentences of a paragraph are given below in jumbled order. Arrange the sentences in the correct order to form a meaningful and coherent paragraph. 

A. Tigers are the largest members of the cat family. They are found in many parts of Asia.

B. They mostly live in dark forests and sleep during the day. They come out for hunting pigs and deer by night.

C. It is assumed that, probably, around 3,000 tigers live in the wild. This species looks spectacular and grand and they are very graceful in their movements.

D. It is almost impossible for us to see them against a jungle background, especially when they are standing still, because of their striped coats. Unlike, most cats, the tiger likes bathing very much.

In these questions read each sentence to find out whether there is any error in it. If there is no error, the answer is (D).

I like reading (A) / more than (B)/ to play (C)./ No error (D).

If an equilateral triangle is inscribed in a circle of area 48 π square units, then the perimeter of the triangle is:

In each of the questions, four alternatives are given for the Idiom/Phrase. Choose the alternative which best expresses the meaning of the Idiom/Phrase and click the button corresponding to it.
Bone of contention

The simple interest on a certain sum of money at the rate of 5 % per annum for 8 years is ₹ 840. Rate of interest for which the same amount of interest can be received on the same sum after 5 years is?