The total cost for the legos are 3 x $250 = $<<3*250=750>>750.
The total cost for the toy swords is 7 x $120 = $<<7*120=840>>840.
The total cost for the play doughs is 10 x $35 = $<<10*35=350>>350.
Therefore the total cost for everything is $750 + $840 + $350 = $<<750+840+350=1940>>1940.
#### 1940