DSE-2011,question 40,46,47

[sonudelhi]

40. A student has opportunity to take a test at most thrice....(plz refer dse2011 series 01)
a.50
b.62.5
c.75
d.87.5

how should i proceed?

also question 46,47(exchange economy) of same exam

[sonudelhi]

plz help anyone asap

[sonudelhi]

plz help anyone asap