Find out: the formula of the big turntable raffle? Thank you!

problem description

it is known that I have a turntable with four (not fixed) contents. At present, I can successfully get the information of the target item after rotation (subscript).
but I can never turn the turntable to the expected position (forgive my stupidity)

related codes

/ / Please paste the code text below (do not replace the code with pictures)

this.start_rotating_degree + 360 * 10 + Math.floor(-360 * 100 / this.prize_list.length) / 200 - Math.floor(360 * 100 / this.prize_list.length) * result_index / 100;

above is my current code, where

start_rotating_degree: 0, //
prize_list: [{},{},{}]
result_index

what result do you expect?

go to the corresponding target item

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MySQL Query : SELECT * FROM `codeshelper`.`v9_news` WHERE status=99 AND catid='6' ORDER BY rand() LIMIT 5
MySQL Error : Disk full (/tmp/#sql-temptable-64f5-1b39c90-2b524.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1b39c90-2b524.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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