Correct Answer - Option 1 : 10%
Given:
Cost price ∶ Selling price = 10 ∶ 9
Formula Used:
Loss = Cost Price - Selling Price
Loss% = Loss/Cost price × 100
Calculation:
Let assume cost price be = 10x
Selling price = 9x
⇒ Loss = 10x - 9x = x
According to the formula used
⇒ Loss% = (x/10x) ×100 = 10%
∴ The correct option is 1 i.e.10%