Question

The cost price of 12pen is equal to the selling price of 18 pen find gain or loss percent

Answer 1

let CP of 12 pens = ₹12
so CP of 18 pens = ₹18
but in ques SP of 18 pens = ₹12
so loss= 18-12= 6

loss % =
$\frac{6}{18} \times 100 = 33.33\%$