What if I parking my MNX before the 10th of May with the old rate. Let's say, I parked on the 25th of April by taking a duration of 1 month. Whether after the 10th of May, the rate parking will automatically change or stay at the old rate until my monthly parking limit is completed.
Parking rates are fixed for existing parking. I.e. if you have active parking, you will be paid according to it even if the rates change by the time your parking is over.