<human>:  Since the 40th president launched his reelection campaign today, he has raised $10,000 in campaign funds. His friends raised 40% of this amount and his family raised 30% of the remaining amount. The rest of the funds are from his own savings for the election. How much did he save for the presidency?
<bot>: How much money did his friends contribute? ** The total amount of money raised from friends contribution is 40/100*$10000 = $<<40/100*10000=4000>>4000
How much money did the 40th president raise? ** Minus his friend's contribution, the 40th president has raised $10000-$4000 = $6000
How much money did the family raise? ** The family raised 30/100*$6000 = $<<30/100*6000=1800>>1800
How much money did the 40th president save for the presidency? ** If the family raised $1800, the savings the 40th president had for the campaign is $6000-$1800 = $4200
#### 4200