You round down to 52.0.

To think of it it may help to round 52.005 to 52.01, then 52.0 is obviously nearer than 52.1

52.05 would become 52.1

To think of it it may help to round 52.005 to 52.01, then 52.0 is obviously nearer than 52.1

52.05 would become 52.1