IBPS SO Prelims Exam Model Paper 5

Given,
Cost price of 1 kg salt = Rs. 40
Cost price of 1 kg rock salt = Rs. 70
Using alligation rule,
Let Cost price of salt mixture be Rs. A.
⇒ 3 : 1 = (70 – A) : (A – 40)
⇒ 3A – 120 = 70 – A
⇒ A = 47.5
Cost price of salt mixture = Rs. 47.5
Selling price of salt mixture = Rs. 57
Profit percentage =
= [

(57–47.5)

47.5

] × 100
= 20%