programing s7200 AI to mesured value

Dears

I need to program S7200u plc ( 224XP) for analog input as below please one can send me the lest of instructions in sequence

1) input 4-20 Ma total 3 AI

2) get the average posative value of all three AI

2) where as 4Ma=0 A

3) and 20Ma= 1500A

4) display correct mesu

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