Question

if sp of 5 pens is equal to the cp of four pens ,then the gain or loss% is​

Answer 1

Answer:

Let the cost price of 1 book = Rs 1  

Cost of  5 pens = Rs 5

Selling price of 5 pens = 4

Gain = 5-4 = 1

Gain % = gain/cost × 100

         = 1/5 × 100

         =  20 %