Answer:
Let C.P be x S.R = Rs 280 Profit = 5% S.P = C.R + Profit 280 = x +\[\frac{5}{100}x\] \[=x+\frac{X}{20}\] \[280=\frac{21x}{20}\] thus, \[x=\frac{280\times 20}{21}=\frac{800}{3}\] = 266-66 \[\therefore \] C.P of article = Rs 266-66.
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