1. Convert all measurements to meters:

* 50.7 mm: There are 1000 millimeters (mm) in 1 meter (m), so 50.7 mm is equal to 50.7 / 1000 = 0.0507 m.

* 47.5 cm: There are 100 centimeters (cm) in 1 meter (m), so 47.5 cm is equal to 47.5 / 100 = 0.475 m.

* 8.01 m: This is already in meters.

2. Add the measurements in meters:

* 0.0507 m + 0.475 m + 8.01 m = 8.5357 m

Therefore, the sum of 50.7 mm, 47.5 cm, and 8.01 m is 8.5357 meters.