Ask Midpoint High Thinkscript Code

[rofudu]

Hi Master,

I'm new in programming language, and still learning the thinkscript code.
I would appreciate if you help me make the thinkscript code for this formula :

I want to make the line in My TOS chart as the midpoint of past 60 days with this formula:

((highest high price for the past 60 days) + (lowest low price for the past 60 days)) ÷ 2 = midpoint of past 60 days.

And then the line as calculate values for the following percentages above and below the midpoint of the range:
+20%
+15%
+10%
+5%
Mindpoint of past 60 days
-5%
-10%
-15%
-20%

Thank you very much for your kindness.

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