upper and lower bounds ( PLEASE HELP ASAP)

so i dont know what steps im missing but im only getting 3/5 marks so could someone please tell me the missing steps :
THE QUESTION
a rectangular floor tile is shown
its dimensions are given to the nearest 0.1 meters
width = 2.3m
length = 1.6m
the tile is only able to sustain a maximum pressure of 200 newtons per square meter (N/ m squared)
correct to the nearest 5 N/ m squared
given that pressure = force /area
work out the MAXIMUM force in newtons that can SAFELY be applied to the tile

MY WORKING OUT THAT HAS 3/5 MARKS
area
1.65 × 2.35 = 3.88
1.55 × 2.25 = 3.49
2.25 x 1.65 =3.71
1.55 x 2.35 = 3.64
pressure
upper bound = 202.5
lower bound = 197.5

SOMEONE PLEASE TELL ME WHAT IM MISSING