It depends on what a 'reasonable estimator' is. A good estimator is usually one which is considered unbiased. That is
Expected value of the estimator = E[x] = the answer
In your case, the E[x] = 500 but the answer is actually 490. This represents a 2% margin of error. Since it's a pretty simple computation, I personally think that error is not reasonable.
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4,33
Take 80% of 500 and you get 400
500/10 = 50
The 2 numbers that total 500 and are different by 156 are 328 and 172.
520 + 290 = 810