Question

A dealer offers a discount of 10% on the marked price of an article and still makes a profit of 20% if its marked price is 800 then the cost price is?

Answer 1

it means Cost price is 30% less then Marked price
so..
Cp = Mp-30%
Cp = 800 - (30×800)/100
Cp = 800 - 240
Cp = 560

Answer 2

M.p of of an article= Rs 800
Discount= 10%
S.p = M.p( 100- discount% /100)
then,
S.p = 800( 100-10/100)
= Rs 720
now,
S.p = Rs 720
profit = 20%
let the C.P of an article be Rs 100
C.P = c.p/gain×s.p
C.P = 100/ 120×720
C.P= Rs 600

HOPE, IT HELPED