The largest x can be is 2.325 while the smallest it can be is 2.315.

The largest y can be is 0.455 while the smallest it can be is 0.445.

"Largest x- largest y" is 2.325- .455= 1.87.

"Largest x- smallest y" is 2.325- .445= 1.88.

"Smallest x- largest y" is 2.314- .455= 1.859.

"Smallest x- smallest y" is 2.314- .445= 1.869.

The largest of those is 1.88, the smallest is 1.859.

Dividing by a smaller number makes the result larger while dividing by a larger number makes the result smaller, so

Dividing the largest, 1.88, by the smallest y, 1.88/.445= 4.225.

Dividing the smallest, 1.859, by the largest y, 1.859/.455= 4.086.

Those are the largest and smallest possible values for (x- y)/y.

Since the "central" value is (2.32- 45)/.45= 4.156, the possible error are 4.225- 4.156= 0.069 on the "positive side" and 4.156- 4.086= 0.07. To be certain that we are inside the possible range of errors, we have to say . The maximum error is 0.07.

The percentage error is 0.07/4.156= 0.017 or 1.7%.