ํ•˜๋‹‰ ์‚ผ์„ฑ

ํ˜„๋Œ€์ฐจย 

๊ธฐํƒ€๋“ฑ๋“ฑ 7-10%์”ฉ ๋น ์กŒ๋‹ค๊ฐ€


3-4% ํ›„๋‹ค๋‹ฅ๋ฐ˜๋“ฑ์ฃผ๋…ธ