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?
Heaven and her younger brother want to buy school supplies, so they ask their father for money, who gives them $[AMOUNT] in total to use. Heaven buys [NUMBER] sharpeners and [NUMBER] notebooks at $[AMOUNT] each, and her brother uses the remaining amount to buy [NUMBER] erasers at $[AMOUNT] each and some highlighters. How much money did Heaven's brother spend on highlighters?
Heaven spent 2*5=$<<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
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