Question

A clock was sold at $72, incurring a loss of 10% what was its CP

Answer 1

Let the CP be x

Loss = 10%

SP = CP - loss

        x - 10/100*x

      9x/10

Given, SP = $72

⇒9x/10 = 72

⇒ 9x = 72*10

⇒x = 720/9

∴ x = 80

∴The CP of the clock was $80

Answer 2

80 dollars.

$72/10%.

I may be wrong...