[Avodah] arithmetic question

[Eli Turkel]

Chesky supplied the following numbers

* one-sixth of the starting price --
    1/6 * 210 = 35, so both 210 + 35 = 175 and 210 - 35 = 245 are ona'ah.

* one-sixth of the final price --
    6/5 * 210 = 252 --> 1/6 * 252 = 42 = 252 - 210, so 252 is ona'ah; and
    6/7 * 210 = 180 --> 1/6 * 180 = 30 = 210 - 180, so 180 is ona'ah.

Using his figures let me rephrase my question. For simplicity assume we are
talking about an overcharge. The situation is similar for an undercharge

As Chelsky assumes the "real" price is 210
Based on the starting price onaah is 245 based on the final price it is 252.

Question what happens if the price charged is 250
This is greater than 1/6 based on the starting price and so the deal is off
(mekhat taut)
This is less than 1/6 based on the final price and so the deal stands as is

It cant be both - which one is correct?

-- 
Eli Turkel
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