Question

take any price as cost price then -5% and +5%​

Answer 1

Let the cost price = Rs.100

= 100 ( 1 - 5/100) ( 1 + 5/100)

= 100 ( 1 - 1/20) ( 1+ 1/20)

= 100 ( 20 - 1/20) (20+1/20)

= 100 × 19/20 × 21/20

C.P = Rs.99.75