Question 1145441
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Another hastily composed and incorrect response from tutor @CubeyThePenguin....<br>
An error of -1% in the measurement means the measured length was 99% of the actual length.  So the actual length was 69.3/0.99 = 70 (exactly).<br>
The other tutor's calculation was 69.3*1.01 = 69.993, which he rounded off to 70.<br>
The difference between the two answers is small; but in a similar problem where the error was 10% or even 20%, the differences would be significant.<br>