Question

the selling price of 15 articles is equal of the cost price of 12 articles .find gain or loss as percent

Answer 1

S.P of 15 articles = C.P of 12 articles,

then

15×S.P = 12×C.P,

C.P/S.P = 15/12,

C.P/S.P =5/4,

let

C.P =5A,

S.P=4A,

then

loss = 5A-4A=A,

hence

%loss = loss/C.P × 100,

= A/5A × 100,

= 100/5=20%