<u>Answer-</u>
No, the Ruiz family won't get the correct exchange rate.
<u>Solution-</u>
Suppose the family has 100 euros. Using the actual exchange rate, we find they have
If we use the rate 1 euro = 1.35 USD(after rounding off), we would have
It would seem insignificant as it is small, because it is only $0.261. But, the more money they convert with this rate, the more incorrect they will be. If they exchange 1 million euros to dollar with the rounded off rate, they will loose,
So, they will get $2610 less while exchanging 1 million dollar, if they round off the exchange rate.