Long division method is the fastest one in this case. 812/1.16 = 81200 / 116
Long division is a very common method.
Another way is to divide each answer choice by 1.1 and multiply the result by 1.16. If you get $812, then it is the right one. If you see right away that 770 is divisible by 11, then you should start from this one and get the answer really fast.
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