Question

when a book which is cost rupees 20 sold 4 rupees 18 . find gain or loss

Answer 1

book CP. = 20
SP= 18.
when CP is more than SP ,there is loss..
and if SP is more than CP then there is a profit..

so acc. to your question... CP is more than SP
so loss is there of 2 rs.
20 - 18 = 2

loss % = loss/cp × 100
2/20×100
= 10% loss