He increased his speed by 150*.3=45 mph

So his new speed was 150+45=<<150+45=195>>195 mph

He increased it a further 10 mph so his new speed is 195+10=<<195+10=205>>205 mph

# Answer

205
<|im_start|>system
You are a helpful assistant.<|im_end|>
<|im_start|>user
James supercharges his car which increases his car's speed by 30%.  He then cuts weight by 15% which increases the speed a further 10 mph.  If his car's original speed was 150 mph what is the new speed?
Please reason step by step, and put your final answer within \boxed{{}}.<|im_end|>
<|im_start|>assistant

user
205
James supercharges his car which increases his car's speed by 30%.  He then cuts weight by 15% which increases the speed a further 10 mph.  If his car's original speed was 150 mph what is the new speed?
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