While visiting Mount Rushmore in Rapid City, South Dakota, Landon approximated the angle of elevation to the

Question:

While visiting Mount Rushmore in Rapid City, South Dakota, Landon approximated the angle of elevation to the top of George Washington’s head to be 35°. After walking 250 ft closer, he guessed that the angle of elevation had increased by 15°. Approximate the height of the Mount Rushmore memorial, to the top of George Washington’s head. Round the answer to the nearest foot.