Question

The marked price of a book is 360. The dealer offers a discount of 10% and still makes a
profit of 20%. Find its selling price and cost price.
​

Answer 1

Given:

MP = Rs. 360

D % = 10 %

P % = 20 %

SOLUTION:

SP = MP - D % of MP

$= rs. \: 360 - \frac{10}{100} \times rs. \: 360$

$= rs.360 - rs.36$

$= rs. \: 324$

Therefore, SP = Rs. 324

SP = (1 + p%/100) × CP

Rs. 324 = (1 + 20/100) × CP

Rs. 324 = (12/10) × CP

(Rs. 324 × 10)/12 = CP

Rs. 3240/12 = CP

Rs. 270 = CP

Therefore,

CP = Rs. 270

SP = Rs. 324