RRB Group-D Model Paper 17 with answers for online practice

Given:
Selling price = Rs. 4900
Loss % = 12.5%
Formula used:
Profit % = [(SP – CP)/CP] × 100
Loss % = [(CP – SP)/CP] × 100
Calculations:
Let the cost price of the book be Rs. x and the new selling price be Rs. y
⇒ [(x – 4900)/x] × 100 = 12.5
⇒ (x – 4900)/x = 1/8
⇒ 8x – 4900 × 8 = x
⇒ 7x = 4900 × 8
⇒ x = 700 × 8
⇒ x = Rs. 5600
To earn a profit of 25%
⇒ [(y – 5600)/5600] × 100 = 25
⇒ (y – 5600)/5600 = 1/4
⇒ 4y – 5600 × 4 = 5600
⇒ 4y = 5600 + 5600 × 4
⇒ 4y = 5 × 5600
⇒ y = 5 × 1400
⇒ y = Rs. 7000
∴ The book should be sold for Rs. 7000 to earn a profit of 25%