Trade

Earnings of a person selling Christmas trees and related products

Q: My brother sells Christmas trees, Christmas related products on which happy Christmas is written and he paid my education fee. 

Will my income be halaal if i use the knowledge as a job or business that I get from my education and can I live in his house that he made from this money? 

Also, he gave me a laptop that he bought from that money and I work on the laptop as a freelancer. I use the Internet on this laptop and he also pays the bill of this Internet from that money. Will my income be halaal that I make from that money?

Informing the customer about a defect in the product

Q: I sell 1m lengths of pipe at R80. I purchase these ready cut. I have a marking on my counter to measure 1m. Those who purchase don't specifically require 1m but purchase the metre as that's how it's sold. It is advertised as 1m. I noticed a pipe today that was marginally short. I therefore refunded R2 to the customer but did not inform him why. The pipe will still fulfill the function for which it was purchased. What is the ruling regarding this transaction?