What number should be subtracted from the product 1109 × 505 so as to get 505050?

A man saves ₹1,000 monthly. What will be his total savings in 6 months?

The four fundamental operations in arithmetic are:

The car parking rates at a railway station parking lot are as follows: (a) Up to 2 hours - Rs. 50 (b) More than 2 hours and up to 5 hours - Rs. 75 (c) After 5 hours - Rs. 10 per extra hour up to 8 hours (d) More than 8 hours and up to 12 hours - Rs. 150 (e) More than 12 hours and up to 24 hours - Rs. 250 Rajeev parks his car at 7:00 a.m. and comes back to pick it up at 4:30 p.m. on the same day. How much money does he have to pay?