Each plastic chair costs $55/5 = $<<55/5=11>>11.
Two chairs cost $11 x 2 = $<<11*2=22>>22.
A portable table costs $11 x 3 = $<<11*3=33>>33.
Manny has to pay a total of $22 + $33 = $<<22+33=55>>55.
Thus, Manny will be left with $100 - $55 = $<<100-55=45>>45.
#### 45