What should come in place of question mark (?) in the following number series ?
Multiples of 0.5 are multiplied
8 $$\times 0.5$$ = 4
4Â $$\times 1$$ =Â 4
4Â $$\times 1.5$$ = 6
6Â $$\times 2$$ =Â 12
12Â $$\times 2.5$$ = 30Â
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