Two pairs of sneakers cost 2 x $100 = $<<2*100=200>>200.
So, Leonard spent $50 + $200 = $<<50+200=250>>250.
Two pairs of jeans cost 2 x $50 = $<<2*50=100>>100.
Thus, Michael spent $100 + $100 = $<<100+100=200>>200.
Therefore, they spent a total of $250 + $200 = $<<250+200=450>>450 in all.
#### 450