Bob travels from Inglewood to Anytown; a distance of 20 kilometres. He walks 800 metres and cycles the rest of the way. What percentage of the journey does he travel by bicycle?

we know that

800 m-----------> 0.8 km
total distance is--------------> 20 km

if Bob walks 800 m then he travel by bicycle ----> 20 km-0.8 km---> 19.2 km

if 20 km-------------> is 100%
19.2 km-------------> X
X=19.2*100/20---------> X=96%

the answer is 96%