Anumber changed to 12.6 after it was rounded. to what place was the number rounded

It is saturday morning and jeremy has discovered he has a leak coming from the water heater in his attic. since plumbers charge extra to come out on the weekends, jeremy is planning to use buckets to catch the dripping water. he places a bucket under the drip and steps outside to walk the dog. in half an hour the bucket is 1/5 of the way full. what is the rate at which the water is leaking per hour?

Can someone show me step by step how to do this?

E. which of the following is not a possible probability? a. 25/100 b. 1.25 c. 1 d. 0