Original price is $700
The desk being sold at a 40% discount means that there is a discount of 40% from the desk real price.
Discount rate = 40%
The sales price = $420
The original sales price = ?
Original sales price = Sales price / (1 - Rate)
Original sales price = $420 / (1 - 40%)
Original sales price = $420 / 0.60
Original sales price = $700
In conclusion, the original price of the desk is $700
Proof-check: $700 x 40% discount = $280 discount. The actual amount paid is $420 ($700 - $280)
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