Let the cost price = x
let the gain when it is sod at Rs 78 is y%.Thus
When it is sold at Rs. 83, gain is 20% more or gain is (y+20)%.ThusSo the cost price is Rs. 25.
Let cost price = x
When the cloth is sold at Rs 83 instead of Rs 78,
more gain = 83 - 78 = Rs. 5
given that more gain = 20%.So Cost price is Rs. 25