A shop keeper purchased a chair marked at ₹ 800, at two successive discounts of 10 % and 15% respectively. He spent ₹ 28 on transportation and sold the chair for ₹ 800. His gain percent is: 

If tan α = 2, then the value of   $$ {cosec^2 α - sec^2 α}\over{cosec^2 α + sec^2 α}   $$ is : 

A person started his journey in the morning.  At 11.a.m he covered of the journey and on the same day at 4.30 p.m. he covered  of the journey. He started his journey at? 

What is the sum of all natural numbers between 100 and 400 which are divisible by 13? 

Read the following graph carefully and answer the related questions-

Total number of students (in thousands) participating in comitative exam in various cities.

What is the average number of students appearing in competitive exam from all the states together? 

A dealer buys a table listed at Rs 1,500 and gets successive discounts of 20% and 10%. He spends Rs. 20 on transportation and sells it at a profit of 20%. The selling price of the table is

The HCF and LCM of two numbers are 12 and 336 respectively. If one of the number is 84, the other is