Four friends ('P', 'Q', 'R', and 'S') went out for dinner and received a bill of Rs. 1,500. They divided it such that 'P' paid (1/4)th of what the other three paid together. 'Q' paid 10% less than the amount paid by 'P'. 'R' and 'S' paid equal amounts, which were Rs. 50 more than the amount paid by 'P'. Find the amount paid by 'Q'.