Net area calculation
Hi guys I have a problem understanding this question from the ARE5 prcatice exam. It's seems straight forward but i still don't understand it. Can anyone help
The developer of a retail shopping complex has estimated through an economic analysis that he can afford to build up to 85,000 of gross building area. A central enclosed pedestrian mall will occupy 6% of the building, and the efficiency ratio is estimated to be 75%, Approx. how much net rent able area will be available.
A) 59,900
B) 63,700
c) 67,600
D) 107,000
The answer is A but what I dont understand is why the 6% is removed from the gross before the Net is calculated

The question states the total gross SF at 85,000 and states the pedestrian mall is 6% of the building (not of net SF)
it goes on to state the efficient ratio is 75% (that is net/gross = .75) and asks how much rentable area is available. If businesses and shops are unable to rent within the pedestrian zone, you must deduct the 6% from the gross prior to calculating the net rentable.
85,000 x .94 = 79,900 gross SF of entire building minus pedestrian mall
79,900 SF x .75 = 59,925 net rentable SF
Solution: A) 59,900 SF

I did this a bit differently but came out with the same answer..... is there legitimately more than one way to skin this cat??
85,000 x .06 = 5,100 (to remove the 'pedestrian paths')
85000  5,100 = 79,990 (new building gross)
79,990 x .25 (inverse of 75%) = 19,975 (efficiency ratio)
79,990  19,975 = 59,925 (removed efficiency to find net)
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