Is 1000SGD ~ 5900 HKD enough to submit for HK visa for 7D6N?

Hi, I'm from Vietnam and will have to apply for an entry permit to visit HK, is 1000SGD enough to submit for HK application for 7D6N? because they only said that we should have adequate funds to cover our expenses? So how much will they know will be adequate? and how much should be adequate in their point of view?
So i'm planning to spend around SGD100 per day, so 7D6N will be SGD700, so I put $1000, is it considered enough? I'm kinda worried abt the issue.
looking forwards to seeing your reply.