Cost price of 25 chairs equals the selling price of 20 chairs. Find the profit %.

Study the following graph carefully to answer the given questions

R started the work and left after some days, when 25% work was done. After it Z joined and completed it working for 25 days. In how many days R and Z can do the complete work, working together?

A, B and C together invests ₹53,000 in a business. A invests ₹5,000 more than B and B ₹invests 6,000 more than C. Out of a total profit of ₹31,800, find the share of A.

The sum of the present ages of a father and son is 52 years. Four years hence, the son's age will be $${1\over 4}$$that of the father. What will be the ratio of the ages of the son and father, 10 years from now?

On a certain sum of money, the simple interest for 2 years is Rs. 350 at the rate of 4 % per annum. If it was invested at compound interest at the same rate for the same duration as before, how much more interest would be earned? 

Ram walks a certain distance and rides back taking a total time of 37 minutes. Ram could walk both ways in 55 minutes. How long would it take Ram to ride both ways?

A cistern has 3 pipes A, B and C. A and B can fill it in 3 and 4 hours respectively, and C can empty it in 1 hour. If the pipes are opened at 3 p.m., 4 p.m. and 5 p.m. respectively on the same day, the cistern will be empty at-

Directions: The following questions are accompanied by three statements (A) or (I), (B) or (II), and (C) or (III). You have to determine which statement(s) is/are sufficient/necessary to answer the questions.

A shopkeeper sold an article and got Rs 300 as profit. Find the profit percentage.
A. Selling price of the article is Rs 1200.
B. He gave 25% discount, which is Rs 400, on the labelled price.
C. Cost price of the article is Rs 900.