Consider the transportation problem and its optimal solution $($stepping stone$)$in the tables below. What is total shipping cost? $[$Blank$1]$

Costs Dest $1$ Dest $2$ Dest $3$ Dest $4$ Supply

S $11218911105$

S $21973015145$

S $3810141650$

Demand $80607090$

$300/300$

Group of answer choices

$$3,140$

$300$ units

$$0$

$$2,100$

$$169$