Answer:
$305
Step-by-step explanation:
Method 1
1000 - 600 = 400
400 - 65 = 335
335 - 30 = 305
Method 2
600 + 65 + 30 = 695
1000 - 695 = 305
20% of 1000 is 200, but subtracting all his "I need to pay", leaves him with 305 so already he has more than 20% saved.
So Brian has $305 left.