Question

the cost price of an article is 30% less than its selling price find the profit or loss as percent

Answer 1

let SP = x
then according to question,
CP = x - 30% of x
= x- (30/100)× x
=x-(3/10)×x
= x-3x/10
= 7x/10
now as SP>CP therefore it is profit
so
profit = SP-CP
= x- 7x/10
= 3x/10
profit % = (profit/CP) × 100
= (3x/10/7x/10)× 100
= (3x/10 × 10/7x)×100
= 3/7 × 100 = 300/7 = 42.8 %
Hope this helps although I'm not completely sure

Answer 2

please mark this answer as a brainliest