Question

An umbrella was sold for Rs 72 at a loss of 10%. What would have been the cost price of the umbrella?

Answer 1

CP=100/100-loss%*SP
=100/100-10*72
=100/90*72
=10/9*72
=10/1*8
=80

hence, CP is RS 80

Answer 2

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Here is your answer.

As we know the formula,

$cp = sp( \frac{100}{100 - loss\%} ) \\ \\ = 72( \frac{100}{100 - 10} ) \\ \\ = \frac{72 \times 100}{90} \\ \\ cp = rs. \: 80$
Therefore, Cost price = Rs. 80

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