40% off monsoon sale

In September 2009, the sales of a product were (2)/(3)rd of that in July 2009. In November 2009 ,the sales of the product were higher by 5% as compared to September 2009. How much is the percentage of increase in sales in November 2009 with respect to the base figure in July 2009? -20% b.25% c.-30% d.+40%

If 30% of x is same as 40% of y then what is y : x ?

When 40% of a number is added to 42, the result is the number itself. The number is :

40% of ? =240

What is the difference between 40% of A and 40% of (A +7000).