$100$ arithmetic means are inserted between $x$ and $y$. The common difference $d$ is

The municipal corporation authorities decided to plant trees on either side of a highway. The sum of all the numbers allotted to the trees was $1260$. Find the total number of trees on the highway if the first tree is numbered as $0, 2^{\mathrm{nd}}$ as $2$ and $3^{\mathrm{rd}}$ as $4$ and so on.