Dart chart

Example

 
 
+1
 
 
 
 
.4
 
.5
 
 
 
 
+12
 
 

Solution

 
 
+1
 
 
 
7
8
 
.4
 
.5
 
28
40
 
 
 
+12
 
 
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Dart chart
Dart chart

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