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?
The total amount of money raised from friends contribution is 40/100*$10000 = $<<40/100*10000=4000>>4000
Minus his friend's contribution, the 40th president has raised $10000-$4000 = $6000
The family raised 30/100*$6000 = $<<30/100*6000=1800>>1800
If the family raised $1800, the savings the 40th president had for the campaign is $6000-$1800 = $4200
#### 4200