He buys the silver for 1.5*$20=$<<1.5*20=30>>30
He bought 1.5*2=<<1.5*2=3>>3 ounces of gold
The gold is worth %20*50=$<<20*50=1000>>1000 per ounce
So he buys 3*$1000=$<<3*1000=3000>>3000 on gold
So he spent $30+$3000=$<<30+3000=3030>>3030 on everything
#### 3030