Answer
Company A: $\$307,000$.
Company B: $\$324,000$.
Company B pays higher salary than A.
Work Step by Step
For Company A
Starting salary $=\$19,000$.
Increment per year $\$=2,600$
Increased salary after tenth year
$=19,000+(10-1)2,600$
$=19,000+9\cdot 2,600$
$=\$42,400$.
Total Sum of the salary over a ten-year period is
$=\frac{10}{2}(19,000+42,400)$
$=5\cdot (61,400)$
$=\$307,000$.
For Company B.
Starting salary $=\$27,000$.
Increment per year $\$=1,200$.
Increased salary after tenth year
$=27,000+(10-1)1,200$
$=27,000+9\cdot 1,200$
$=\$37,800$.
Total Sum of the salary over a ten-year period is
$=\frac{10}{2}(27,000+37,800)$
$=5\cdot (64,800)$
$=\$324,000$.
