- Rs. 1000
- Rs. 810
- Rs. 990
- Rs. 1080

Option 1 : Rs. 1000

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**Given:**

Selling Price = Rs. 900

Lose % = 10%

**Formula used:**

CP = SP × [100/(100 - Loss %)]

Where, CP = Cost price, SP = Selling Price

**Calculation:**

According to the question

CP = 900 × [100/(100 - 10)]

⇒ CP = (900 × 100)/90

⇒ CP = Rs. 1000

**∴ The cost price of phone is Rs. 1000.**

Loss = CP - SP

SP = CP × [(100 - Loss %)/100]

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