Ok let's imagine the folloing josh had 200k mary has 5k and mark will have 500k who has the most amount of money

The first thing you should know in this case is that we use k when:

k = 1000

We have then:

Had

200k = 200000

Has

5k = 5000

Will have

500k = 500000

Assuming that all units are in the same currency ($ for example), then Mary has the most money.

Answer:

Mary has the most amount of money