Black printer inks will cost him 2 x $11 = $<<2*11=22>>22.
Red printer inks will cost him 3 x $15 = $<<3*15=45>>45.
And yellow printer inks will cost him 2 x $13 = $<<2*13=26>>26.
The total amount he has to pay for the printer inks is $22 + $45 + $26 = $<<22+45+26=93>>93
Therefore, Phantom has to ask $93 - $50 = $<<93-50=43>>43 more from his mom to be able to buy the printer inks.
#### 43