Mohan, a shopkeeper, bought a shirt of list price ₹225 at a discount of 20%. If he wants a profit of 30% then he should sell the shirt for:

Cost of 36 pens and 42 Pencils is Rs 460. What is the cost of 18 pens and 21 pencils?

In each of the following questions, which one of the four interchanges in signs and numbers would make the given equation correct?
( 3÷4 ) + 2=2 

If the graph of the equations x + y = 0 and 5y + 7x =24 intersect at (m, n), then the value of m + n is :

If cos²α + cos²β = 2, then the value of tan³ α + sin⁵ β is :

Simple Interest received by a person in 10 years on a principal. of the Rs. 9500 is 130% of the principal. What is the rate of interest (in %) per annum? 

The 'Greenhouse effect' is produced due to the presence of excess amount of  

Which of the following is biodegradable?