Would be plez i really need ! 10

a young sumo wrestler decided to go on a special diet to gain weight rapidly. he gained weight at a constant rate.
the table compares the wrestler's weight (in kilograms) and the time since he started his diet (in months).

time(months) - weight(kilograms)
0.5 80.6
2 88.4
3.5 96.2

what was the wrestler's weight before he went on his diet?

kilograms