Let assume CP to be Rs x
Then, loss in rupess =$$\frac{20}{100}\times x$$ = $$\frac{x}{5}$$
Since SP = CP - Loss
SP = Rs x - $$\frac{x}{5}$$
=$$\frac{4x}{5}$$
given that sp = 280
so,
280 = $$\frac{4x}{5}$$
so x = 350
so cp = Rs 350
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