Aman borrowed a sum of Rs. 2450 from Amit at the simple rate of 8% p.a. for 5 years. He then added some more money to the borrowed sum and lent it to Pragyan for the same time at 11% p.a. at simple interest. If Aman gains Rs. 372 by way of interest on borrowed sum as well as his own amount from the whole transaction, then what is the sum lent by him to Pragyan?