Answer: 
The amount collected by lia, phil and cam are $37.5, $50.3 and $112.5 respectively. 
Step-by-step explanation:
Amount collected by Lia, Phil, and Cam for a holiday fundraiser= $200.30
Let the amount collected by lia be $n. 
Phil collects $12.80 more than Lia. 
Then, amount collected by phil will be $(n + 12.8) 
Cam collects 3 times as much as Lia. 
Then, amount collected by cam will be $3n 
Now, we know that, total amount = $200.3 
Lia amount + phil amount + cam amount = 200.3 
n + n + 12.8 + 3n = 200.3 
 5n = 200.3 – 12.8 
 5n = 187.5 

 n = 37.5 
Then , amount collected by phil will be
$(n + 12.8) = $(37.5 + 12.8) = $50.3 and 
The amount collected by cam will be 
$3n = $(37.5 x 3) = $112.5