Firstly, fractional shares are ignored for rights calculation. So, against 1500 shares, you will be entitled rights of 100 shares and the additional 10 shares will be ignored for the purpose of calculation of rights. In terms of payment for rights shares, in the first tranche at the time of application to the rights, investors only need to pay 25% of the rights price of Rs.1257. Thus, investors will have to pay Rs.314.25 at the time of application, which will consist of Rs.2.50 as par value and the balance as premium. The company press release has mentioned that the remaining amount shall be collected in one or two tranches later. That means; the rights would trade as partly paid shares to begin with. You need to await details of the partly paid rights trading and the ISIN.