Question

A person sells his computer for Rs. 18000
making a profit of 20%. How much did the
computer cost him?
​

Answer 1

Answer:

Let original cost be x

So, according to question

x + 20% of x = 1800

x + (20/100) × x = 1800

x + x/5 = 1800

6x/5 = 1800

x = (1800×5)/6

x = 1500

original cost is 1500

Answer 2

Step-by-step explanation:

let CP be x

SP = CP + profit Rs

profit% = (profit Rs × 100)/CP

20 × x = profit Rs × 100

=> profit Rs = 20x/100 = x/5

now, 18000 = x + x/5

=> 18000 = 6x/5

=> x = (18000 × 5)/6

=> x = Rs 15,000

therefore cost of the computer is Rs 15,000