New Rates for our Electricity Usage

In Cheshire Home we pay a minimal amount for the use of electricity for our own electrical appliances. It is the Residents' Chairman duty to collect the money for the office every month. This duty had been passed on to my sister, Mary as the existing Chairman had difficulty doing so. It was a task nobody like.
As oil prices went over the months, some have speculated that the Home would up our electricity usage rate. But no concrete evidence was forthcoming and the oil price had started to drop when, out of the blue, the new rates were pinned up on the notice board for all to see. The new rates would take effect in April. As I am the one helping my sister to do the paper work, it means I have quite a bit to do editing the records. Some residents had paid up for the whole year and there are adjustments to be made. Sis, Mary is not going to have an easy job collecting bills in April.