10+50=60 (ten thousand yuan) 2500*5* 12= 150000 (yuan) = 15 (ten thousand yuan) 60+ 15=75 (.

A: That's enough.

2)2500+800=3300 (yuan)

Answer: It is best to pay 3,000 yuan a month for a period of 20 years. Because he can buy a house without renting a house, the remaining salary is 2,500 yuan +800 yuan = 3,300 yuan, so he chooses to pay 3,000 yuan a month for a period of 20 years.