Do you want AMD or nvidia? What's cheaper in India? 5000rs are around 80$, but I don't know what the prices are like in india..
BTW your whole system is pretty bad/old, PS benefits from RAM, both system and vram and in 2D mode there is only a small benefit from a gaming graphics card. I don't think you are doing any 3D stuff with PS with that PC, rendering would take forever.
Nevertheless, a r7 240 could fit in you budget or the nvidia equivalent