Find the cash required to purchase Rs 3200: 7.5% stock at 107 (brokerage 0.5%)

Find the cash realised by selling Rs 2440:9.5% stock at 4 discount (brokerage 0.25%)

The cash realised on selling a 14% stock at Rs 106.25, brokerage being 1/4%, is (a) Rs 105.50 (b) Rs 106 (c) Rs 106.50 (d) Rs 113.75

which is better investment: 7.5% stock at 105 or 6.5% stock at 94