What should come in place of the question mark (?) in the following number series ?
Each number is divided by 5 and then 5 is added to it
3600 $$\div 5 + 5$$ = 725
725 $$\div 5 + 5$$ = 150
150 $$\div 5 + 5$$ = 35
35 $$\div 5 + 5$$ = 12
12 $$\div 5 + 5$$ = 7.4
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