Answer
$1400$
Work Step by Step
Our aim is to determine a formula for the general term of the arithmetic sequence $a_n$.
Such as: $a_n=a_1+(n-1)d$
we have For company A:$a_{10}=24,000+9 (1600)=38400$
and For company B: $b_{10}=28000+9 (1000)=37000$
Thus, we can see that Company A can pay more than Company B, that is $a_{10} \gt b_{10}$
or, $d=2$
Hence, $a_{10} -b_{10}=38400-37000=1400$
