A week after Rs 500 and 1,000 notes were spiked, Prime Minister Narendra Modi's mother Hiraba Modi on Tuesday exchanged demonetised currency for Rs 4,500 at a bank near the state capital Gandhinagar.Wearing a white cotton sari over a dark blue blouse, 96-year-old Hiraba queued up at the Raisan branch of Oriental Bank of Commerce and got notes of Rs 500 and Rs 1,000 exchanged for Rs 4,500, the daily exchange limit.A few people queuing up at the bank made way for her and she went straight to the teller counter.She was given a new Rs 2,000 note, five bills of Rs 100 and two bundles of Rs 10 each containing 100 notes each. Hiraba waved the Rs 2,000 note to journalists waiting outside the bank.