Step-by-step explanation:
Given,
S.p.=Rs400
Loss percent(L%) =20%
C.p.=?
We know,
S.p. =(100-L) % of c.p.
or,400=(100-20)% *c.p.
or,400=80% *c.p.
or, 400=80/100*c.p.
or,c.p.=Rs.500
Here, c.p.=Rs.500
100-20=80%=400
i thimk this might be the answer to question 3 (iii)
I'm sorry I don't know how to solve the first question
Answer:
i am not sure thi sis the first one