On July 16, 2015, Logan acquires land and a building for $500,000 to use in his sole

Question:

On July 16, 2015, Logan acquires land and a building for $500,000 to use in his sole proprietorship. Of the purchase price, $400,000 is allocated to the building, and $100,000 is allocated to the land. Cost recovery of $4,708 is deducted in 2015 for the building (nonresidential real estate).
a. What is the adjusted basis for the land and the building at the acquisition date?
b. What is the adjusted basis for the land and the building at the end of 2015?