Heaven spent 2*5=$<<2*5=10>>10 on sharpeners.

She also spent 4*5 = $<<4*5=20>>20 on notebooks.

Heaven's brother used 10*4 = $<<10*4=40>>40 to buy erasers.

The total amount of money Heaven and her sister spent on sharpeners, notebooks, and erasers is 40+20+10 = $<<40+20+10=70>>70

The total amount of money her brother spent on highlighters is 100-70 =$<<100-70=30>>30

# Answer

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<|im_start|>system
You are a helpful assistant.<|im_end|>
<|im_start|>user
Heaven and her younger brother want to buy school supplies, so they ask their father for money, who gives them $100 in total to use. Heaven buys two sharpeners and four notebooks at $5 each, and her brother uses the remaining amount to buy ten erasers at $4 each and some highlighters. How much money did Heaven's brother spend on highlighters?
Please reason step by step, and put your final answer within \boxed{{}}.<|im_end|>
<|im_start|>assistant

user
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Heaven and her younger brother want to buy school supplies, so they ask their father for money, who gives them $100 in total to use. Heaven buys two sharpeners and four notebooks at $5 each, and her brother uses the remaining amount to buy ten erasers at $4 each and some highlighters. How much money did Heaven's brother spend on highlighters?
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