RRB Group-D Model Paper 18 with answers for online practice

Given:
CP of 18 pen = SP of 12 pen
Formula used:
Gain% = (Gain × 100)/CP
Gain = SP – CP
Calculation:
Let SP of 1 pen be Re 1
So, SP of 18 pens = Rs. 18
CP of 18 pens = SP of 12 pens = Rs. 12
Gain = 18 – 12 = Rs. 6
Gain % = (6/12) × 100) = 50%
∴ The Gain% is 50%