Question

if the cost price of 8 pencil is equal to the selling price of 10 pencil then the loss percentage

Answer 1

let the cost price be "x"
sp be "y"
then 8x=10y
let cp of x pencil be re 1
then cp of 12pencils be rs 12
12=10y
y=10/12=0.83
cp is re 1 n sp is 0.83
so there is a loss as sp is lesser than cp
loss=1-0.83=0.17
loss%=0.17*100/1=17% ans

hope dats the right ans

Answer 2

let the cost price of 8 pencils=₹80. Cost price of one pencil =₹80/8=₹10. Selling Price of 10 pencils=
₹80=> Selling Price of one pencil=₹80/10 =₹8.
Loss% =10-8/10×100=20%.