The sum of the original incomes of ‘P’ and ‘Q’ is Rs. 90000. If the income of ‘P’ had been Rs. 30000 more, then his income would have been 50% more than the original income of ‘Q’. ‘P’ and ‘Q’ spend 80% and 70% of their respective original incomes. Find the difference between savings of ‘P’ and ‘Q’.