Maya can lift 240*0.25=<<240*0.25=60>>60 pounds.
Gaining progress, she can lift up to 60+10=<<60+10=70>>70 pounds.
At her peak, she can lift 300*0.5=<<300*0.5=150>>150 pounds.
Maya's peak is 150 pounds - 60 pounds when she started = <<150-60=90>>90 more pounds than when she started.
#### 90