Whose expenditure is the maximum for the month of June 2013

The difference (in INR) in discounts between two successive discounts of 8% each and a single discount of 16% on INR 1000/- is :

The rate of interest per annum at which the total simple interest of a certain capital for 1 year is equal to the total simple interest of the same capital at the rate of 5% per annum for 2 years is :

4 6 12 ? 90 315 1260

12 12 18 36 90 270 ?

1015 508 255 129 66.5 ? 20.875