The gummy bears cost 10*2=$<<10*2=20>>20.
The chocolate chips cost 5*20=$<<5*20=100>>100.
The total cost for these two is 100+20=$<<100+20=120>>120.
The chocolate bars in total cost 150-120=$<<150-120=30>>30.
A single chocolate bar costs 30/10=$<<30/10=3>>3.
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