He sold 2*25=<<2*25=50>>50 amulets
So he made 40*50=$<<40*50=2000>>2000
The faire took 2000*.1=$<<2000*.1=200>>200
So he kept 2000-200=$<<2000-200=1800>>1800
The amulets cost 50*30=$<<50*30=1500>>1500 to make
So he had a profit of 1800-1500=$<<1800-1500=300>>300
#### 300