How Expensive Is It to Build A Classroom?

Does it really cost ₱4-7M to build a classroom? Yes, according to Congressman Zia Adiong. 

There are documents doing the rounds on social media of a proposal of Congressman Adiong of some ₱285M to fund the construction of 8 buildings, at around 62 classrooms. One even shows a building worth ₱30M, which has only 4 classrooms:

Looks expensive to me. Are they building “luxury classrooms” with high-end materials and smart TVs instead of projectors? 

If the Department of Education (DEPED) grants this request, will they not become a party to the overpricing?