Help me with this please

.
Looking the configuration bellow.
policy-map OUT-NET
class A
priority percent 40
class B
bandwidth remaining percent 70
random-detect dscp-based
class C
bandwidth remaining percent 30
random-detect dscp-based
class class-default
fair-queue
random-detect dscp-based
Help me with this please.
Looking the configuration bellow.
If the 75% of bandwidth is the default available per port. Can I use a total of 100% remaining in others clases (70 + 30), I mean the 25 % isolated will be used by class-default?