Acre - Ground - Cent - Please clear my doubts

[Braandan]

In Kerala and Tamilnadu, land is measured out in Cents.
It is an area measurement.
How can I relate cent to an acre.
I know that

1 Acre = 43,560 square feet

1 Acre = How many cents?

Also housing plots are sold in 'Grounds'.
How many cents is 1 ground? I know that a Ground is 2400 square feet.