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No college needed.
1. When you shoot a stage divide the points you shot by the time you shot them in..... That is your hit factor.
2. Whoever has the highest hit factor for that stage wins the stage, and gets all the possible points for that stage. IE, if it's a 32 round field course worth 160 points (5 per A), he/she gets all 160, regardless of how many points they shot. That is the winner's "match points." For everyone that didn't win, divide their hit factor by the winner's hit factor and you get a percentage (number less than 1). You get that percentage of the 160, which is your "match points" for the stage.
3. Add all your match points up. That is your match score. If you have the highest, you're the winner. If you don't, your percentage is the result of dividing your match score by the winner's match score.
For the OP, in stage 1, you won, so you get all 140 points as match points. Everyone else can take their hit factor and divide by yours (6.8737) to the percentage of 140 they will get. In stage 2 (worth 155 points) take your hit factor (4.6667) and divide by Fry's (7.1839) to get .6496. In other words, you shot 64.96 % of him, so you get that percentage of his 155 points, or 100.68.
Once you've paid attention to it a while it will not seem complex. I've found understanding scoring to be valuable occasionally when making decisions about potentially risky stage plans.