Answer
$442500$
Work Step by Step
Sum of the an arithmetic series can be calculated by using formula $S_n=\dfrac{n}{2}(2a_1+(n-1)d)$
Here $n=10$
Thus,
$S_{10}=\dfrac{10}{2}5(a_1+a_{10})$ ...(1)
$a_1=33000$ and $a_{10}=33000+(9)(2500)=55500$
From equation (1), we have
$S_{10}=\dfrac{10}{2}5(a_1+a_{10})=5(33000+55500)=442500$
