Oh goody! Back to aviation.
X wind = all X-wind + 1/2 gust; - in my books, gusts have to be 'considered', no '50%'
Can you land - yes
do you ask the wind when at 200'agl - probably not if it is on my nav display
does the gust veer to reduce the x-wind gust? - in your example, yes (probably), and increase the tailwind
Same argument for man' landing with greater numbers.
2. Tailwind. limit is 10kts. W/V 090/8G15 - again yes (will have had a shufti at the runway performance, mind you)
ask the wind at 200agl? - again probably not