Answer:
100 ? 20 = 80 \[\because \] If amount paid is Rs 80, then the marked price = Rs 100 \[\therefore \] If amount paid is Rs 1, then the marked price = Rs \[\frac{100}{80}\] \[\therefore \] If amount paid is Rs 1600, then the marked price \[=\frac{100}{80}\times 1600\] = Rs 2000 Hence, the marked price of the pair of skates is Rs 2000.
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