Read the following information carefully and answer the questions based on it.

Tarun invested Rs. A for 2 years at (R/2) % p.a. compound interest, compounded annually. After 2 years Tarun lent the received interest to Reeta for three years at R% p.a. compound interest, compounded annually. After three years, Reeta returned Rs. (A/2 + 7900) to Tarun and invested 50% of rest amount at (R -10) % simple interest for 4 years. Simple interest received by Reeta is Rs. 8000. Parul and Priyanka started from Udaipur at same time running in opposite directions, towards Dhaka and Kerala respectively. After reaching their respective destination, they again decided to meet, so Parul meets Priyanka after travelling 48 km from Udaipur. Distance between Dhaka and Kerala is 240 km, while distance between Kerala and Udaipur is (9.5N + R)/2 km. Shop keeper sold two articles X1 after discount of Z% and X2 after two successive discounts of Y% and 20% respectively. He sold Article X1 at Rs. 13500, which is Rs. 1980 more than that of X2. Present age of Parul is 400% more than that present age of his son (Raanu). After 12 years, Age of Parul is 52 years, difference between age of Parul before 20 years and Raanu after 32 years is N years.

Note:
a) Z = N + 5
b) Marked price of X1 is Rs. 2000 more than X2.
c) Speed of Parul is 50% more than Priyanka.