1. (a) The price of a T. V. set inclusive of sales tax of 9% is Rs. 13407/-. Find its marked price. If the sales tax is increased to 13%, how much more does the customer pay for the T. V.?   2. (b) On a certain sum of money, the difference between the compound interest for a year, payable half-yearly, and the simple interest for a year is Rs. 180. Find the sum lent out, if the rate of interest in both the cases is 10%.